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This question is part of a series solving the Rosalind challenges. For the previous question in this series, see Wascally wabbits. The repository with all my up-to-date solutions so far can be found here.

Problem: PROT

The 20 commonly occurring amino acids are abbreviated by using 20 letters from the English alphabet (all letters except for B, J, O, U, X, and Z). Protein strings are constructed from these 20 symbols. Henceforth, the term genetic string will incorporate protein strings along with DNA strings and RNA strings.

The RNA codon table dictates the details regarding the encoding of specific codons into the amino acid alphabet.

Given:

An RNA string \$s\$ corresponding to a strand of mRNA (of length at most 10 kbp).

Return:

The protein string encoded by \$s\$.

Sample Dataset:

AUGGCCAUGGCGCCCAGAACUGAGAUCAAUAGUACCCGUAUUAACGGGUGA

Sample Output:

MAMAPRTEINSTRING

My solution solves the sample dataset and the actual dataset given.

Dataset:

AUGCGCCCUUGGUCGCUCCUUGGAUCAGAGCAUAUUCUAUCACGGCGCGUCGAAGGAAUAACCCACGACAUCUCUCUAUAUUGGAUUCCCUUUUUUUCGGUUCAGGUAGAUCAUUUGGCUACUGGACUUUCUAAGAUUUACUCCGCCAUGUUCCUAUAUGUUACAUUCUCAGCCGAAGUCGCUGUAUAUCACGUUAAGGUAGACGGUUCCUUGACUACCAGCGACGCCUGUAGGGAGAAUUCCAUCCAUCAUGCAUGUAUGGGCAGUGCGCACUUACAGCGCCAUAGGCAACGGACGGACAGACCUCCUUUCCUGUCGGACGGUAAGCCGCGAUCCAAUACAGAGCAAAGUCCCACGCCCUCCUAUAGACUCACGCCAAGAUUGUAUUCCCCGUUAACCGCUCUCUCAGGGAAGUUGUAUCUACUCGGAUCGGGAUGUCCUUGGAAAUGUAGGAAAAUGGCUCAAACUACGAUUGUAUACCGUGCGAGACGUUGGAUCCCGCUUAUCACUGAUACCAUAAUCUGUGUGGCCCCCUUACCACAACCUAACCAUGGAGUAGUAGCCCUGGCCGUCCCUUCAAGGGCAAGACCUCAUUGUCUUGUACGCUUAUCACAAGGGCCAUCUAACAAUGUGUACCGGUAUAAUUUUACGUGGUAUUGUCCAGACGGCGGUACGGCCGAUCCGUUGCCAUUUCGUCAUGGCAUAACCUCGGUCUAUCUUCCUUCCUACUCGGGAAUAGUUCGCAGUACACCAUACCUCAUCGGCACUUACGCUGUUCCAACACAAAAUUCUGAUCCCUUCGCUACCACCCGCUGGGUAUCUGUCAGGUUACUGGCCUCCACUACCGGAGAGGGCGAUACGGGGGACCGCGGAACACUUUCUACAUUUUUGGACUGCUGUAUGUCUACUUCGGCUCUUCCUCCCGCGAGAUUUAUAUCGGCAUACAGAGUAAACGCUACCCAUGGCGACGACACUCGUCUCACCGUUAAGAAGCUGUGCACACCUUAUAAAAGCCUUUGGUCAGGUAAUGUAUGUAGACCUCUAUCGGUCUAUAAGUUGAAGGAAAGAUAUAUAGUCCUCACCGUUGGUUAUCAUUCCCUCCUAUCCCGCAUGUCCACCCUAAGGAAAACUUACUCCGUGGACCAAGCGGGACCGGCAAGGCCCUUGGUUGCCGAAAAAUCAGGAGUUUGCGAGUGCGACUAUGAUCCCAGGUUUGUAAUCGUUAUCGCGACUGUUCAUUUCGGGAAGGCUACUGGGCUGCAUUCAAAGGCGGACCGCUGCUCUCGCUGGGUCGGGUCCAGUGGACGGGUCGAGGCUGCUCAGCUCCAUCAUCAAAGAAAUAAGAAGCCCACCGGAAGAGACAGUGAUGCCGAGAAGAUGUCCGGCAAAGGCAGACUCUGGUCCCAAGUUAGACUGGGUGGUUUAGAGAUCCAGAUAGGUCGUCGUUACCAGUUCUACGAAUACUUUCUUGGUAAACUGAUUAUCCGUCAAAGGCCGACUCACGAGAGGACACAGGGUGCAAAGAAACCCUCACAGAAGGGAACGCGAUUGGCGACACGUAUGGCGCUCGCGUGGUGUGACAGGUUUGGUAGGAUCUAUAUCCCCCAGUGCAACAUAUUAGUUCACACUAUAAUGAAGGUCCGAUUGCACCAAACAGCCUGCGAUGAUAACACGUGGACUGCUGGAGAGUAUGACUUGUACGACUGCACGCGCGAUGUACCCAACAUCGUCCUGUCCCUACCGCACCAUCUUUAUGAACUGCUGGUCUCUGAUGCACUCCCCGCCCCCCACCUCCUCUUUCUGGGGGAAUCUGGUUCCGCCAGGCAUAGGACACGUUCGGUUGGACUAACUAUUGCUAACUACACGAUCAUUCGUGAUAGGUGUCGGUCCACAUGUAUAAGGUUGGAUGAACCUAACCCCUACCGACGAUUUGAUGUAUUGUGGCCACUACUAAUGACCCCCGCUCGUAACACCCAAACACGCGCAUUUCUCUGCUCCGUGGCUGGCUGGAAUUGCCAGUAUUACAGACCCCCUGACAGAUCCAGUAGUAGGACGUACUUGAUCGCACUACAUUUAGCAAUCAAAUUGCGUUCACGCUACCCCAAUCGUUCAGAUCUGGCUUAUCCCACAUCUGUAAACAGGAACACGGUGUAUAUCACCGUAGUCUCUCUACGCACAGCGAAACUAAGAUACAACAGUUACACACCCAGCAAACUGCGGCCCGAUCAAGGCAAUGACCCCAGCUACCGAACUUCGGAAAGAGGGAAUUUCGUCCGGAACUUGCCAUCAGUGAAACCGUACCGAGACUUCAUGAAAACGAUCAGCAUUUCCUUUACAGGAUUCCGGACCAAAUUUGAUCGUCAAAUUGGGAAUUCCAUAGGCCGAGGAUUCACGGGAGCAAGGCCGACCUCAUUGAAGCGUCAUAGUCGCUUUUCGCUCACCGUACAUUCUAGCAAGCGCUAUCUCUCCCGCCUCAACGCCUACGUCUCUUUUACAAUAAAACAUCGGAUAACGAGAUUCGACGUGGCUACGCGCGAAGUUAAGGCUUCCGCCGUGGUACCUAAUGCGGAAAUAGUCCGGAAAAGUACGAAGGUGUGCUGGUUUAUGUGCAUCAUCAGACUCCAAACUGUCCGAGCUACCAAACCGACCAUUCAGAAGCAGUUGUUGAGAUUAAGUGGCCCGUUUCAAUGCGGGGAUUCCACCAAUUACGUACAACCUGGUUACUUCCACAGUUCAAACGCGCCCCGCCCGGCGUGUGUCAGUGUGUGUAUCAGCCCGGGGUUAUGGGACCUGUUGGUAAAAACCCGGAAUGCUUUCUCCCGUGUGCACGGGGGUACUAUCCUUACUUUAGUUCAGCAUGACAUUCAUAAAGUAGAAUUAUCGUCAGCAUGCACUCGCGAGCGGGCUACCAACCUGGCAAUGACUGAAAGCGUAACGUCAUACUCUCAGUGCGAGGCCUCGACUCGCCAUACCGAAAUACAAGCUGUUAGCUCAAUUGUGUAUCUCCACUUGACUGCGGCCCGCAGGGAGAAACACACAGAGAAGAGGGCCGACGCGAAGCAUCAUGUGUCUACUUGGCGCGAGGGUAAAACCGAAAACGUCAUUGGAAGGCUCAGAUCGUCACAUACAUUAACCCUUAGGUUACAUCCAUCCUCGUUGGACAACUGGCCGUUCAUUCUUGGGGAAUGCCAGAGAGGAACGGAUAUCGAGGAACGCAUCCCGGCACAUGCGGAAUGUACAGACAAGGCUGUAGGCGUAGCCUUUCAGUCGACGCUAUGGGCAGAUUCGGCGAAUCCGCGAGGUGGAUCUCGCUUGAGAAGAGGGAUUAGGGGCCCCAACGCGAUGAAUAUUGAAUGCGGAUAUUAUCUGGCGAGACAGCUUCUUGACCGCUCUUGUAGUCGCAAGAUAGGCGAGACUCUAAGACAAACUAGUUCCCGCACGCCAUUGCCAUGCAAGCGAGGCCGCGUCCCAAAACCCCUGGAACCUAAAGAGUCGAACAGGUCAGGAGCAAGUAGCGUAUGGAUACCAGUCGGAGUUAGGCUGGGUCCCUCCGCUGCGAAGACUCCGCCCUGGCGACAUGGUCGCCCGCGACAACUUCUAAUCUCUCCUCAAGUUAUUCCGUUAAGACACCCGAGCAAACGAGCUAGUCAAAGGGAUCAGUGCGAGCUCCCAUCAUGUCCUGAGUACAAGACCCCAGUGUGCCGACUUGCUUUGGGUAGCUCCAGAAUGGUUCACGAAUUAGCCCUUAAGAUGCUCUCCCCUGUUCCGGAGUUCGUGUGGAGGGUCGGAGGCGGGAAAGUCUAUUUAACGGCGGACCCACCUAGGGUAAAUCUGACGCAUAUGUCUGAACACGCCCUGGUGGUACCAGGAGUUUCCCUAUGGGCCCUUUUUCUUUUAAGACCUUUAUUUUUCCAUCUCCAACCUCGAUUAUCGACAACAUACCGUUGGCGCAGACACUUAUGCUUACCCGUUCAACUGCAUUCGUACAGGCUGGGUGAUAUGCAAUUAGGAGCAUCUCGACGUUGGGUAGGCCCCCGAAAUAUAUGGAGACAGGGUGUGUAUGCGUGGGAGAUAUAUGAGAUUCGAACUGUACCGGCUCCAAGGGUGUCACUGUUCCGCCGUUGGAAGGAAAACACUUACACCCUCUUUGGAUCAGGGGAAAUUACAGCGAAUGUUAAGACGGCUAUGUAUCGGAUAACGUCACAUCCGUUUAGACUGUAUGCGGGCGCCCGAGAAUUCAGUCCAUUCCGACUAAACGAGAAAAAGUUUGCCCCCGCGGGGAUUACGUACAAAACCGGAUGCGAUUAUAGCCGUUCUGGAGAACUCUGUGAGGGGCGGGGAAGGAAAAAUAGUUUUAUGUACCAUUGGGCGGCCCUUCCUCUCCAUGCACAUAAAACAAACAGCCUCAUUGAUUUCUACACUCCGUGCAACCCAAAUGCGGCUGCUGACAUGCUAGUGCGUAGUACAGAAGAUGCCCGAGCUCGAAUACAUUGCAGAUAUUGGGUUAACAAUUCGUUUUGCAAAUAUAUAUGUUGGCACUCCAGGUUCUUGAUAGAACCGAUUCAGAAGAAAUGGUGUACACCCAUUGAGAGGCGUCGCCCCGUAAUUAACGGGGAUGUCUUAAACGGGUCAGAGGUAACUACUAAGACGCGGUGCUGUUUCAGAUGGGCAAGUCAUACGGGCCGUUCUUACGGAAGAGAUCGUGCUAAUACAAACCUGCUUGUUAUGGGCGACGCAUCGCCCGAGGGGGGCGCGAAUCGGAGACUUGCAAGUACGACCGGUGGAUUCGUGCAAUUUAAGGUAUACAUUUCACGCGGAGACCCCGGGAAGGAGCUCCCCUACAUAACACGAAUAUCACCCGGCCGAAUUAGGGCUCGACGGUCCUUCCGCCUAAUGUGUGCAGUGAACGAGUUGGUGCCUGAAGAUGGUUUCACUCACAGGCGCCAAAGUACGACUCCUCCUUCCCGAUCAGUUUGCGACGGGCCUGUCCGCUUUAGAAUAAAGACCCACUUCCAAACUUCGACCGGCUGGGGGAAACAUUGGAGCAGCUUCCAAUGUGAUCAAAACUGUAGCAGAUCUCUAGCAUACUUCAAACAGGAAGUUACUGUAUGUGGUGCACGACCUGGCCAAGGUAGUUUCCUCCCCCUAGGACUGGUGAACGAUGGCGGGUGGAUUGUCAUUCAUAGUGAGAGAUUAGCCGUGCCUGCUUAUGACGGGAUCGGCGAUCUAGUAAGCGAUUCCAAAUCGAACAGCAUGCGCCGAGGGGACACUUACUUGGAGGUACUUAUCCGAGCGAAAAGGAGGGAGCCCAUAUCCAAAUGCGCUAGUAGAGGAGCACUGUCGAGUCAUGACCGCGGCCAUUCACUCGUAAGUACAGGGACACACUUCCAUAUCCUCCGGGGACUGAUGGGUAUUCGUACGAUUCGGCUGAGCGGGUCGCGGGACCCUACGGUCCGAACGUCUCGCGAGGGGUGUCAGGCUCCUCAUUUCAUGGUGCAGUCUGUCUGGAAGCCGACUACACUACGGGGUAGUCCUGCCCUUGAUAAUGCUAAUGAGAGUAACUCACGCCCCGCCCAUAACAAAGGCCGGGGGCCCUCUCAAUCAAACAGGCGGACGGGGAAUGUCAGGCAGGUUGUCGUUGGCAGAGUUACGCUCUCGCAGGAGAUUAAUCCUUUUGUAAAGCAUUUGGAACUAGUCCCCGGCUAUUAUUUAGCUGAGUAUCCAAUGCCUAGAAGCCUUGCGUCCCGUUCUAACCUGCGCGUAAUUCAUACAUCGCAUGAGAGAGCAAGGCAAACAAUCCAUUCGCCUGGCAAGAGAAACCGAGGAGCAAGUCACCGAACGCCCGCCGGGAAGCACCGCGAGUACCCACGACAAAACAGCUGCUUGGACUAUUAUGAACCCUCCAUACGUAGGAAGGAGGCCUAUGGGUGCGUCAAUAACGCACUCCCUGAUUGUCCUGACAAGGACGAUCGCGAAUGGACGCGCUCGCAAUCCAUGAUUGAAAUGUCCAGACCAACCGAGUCCCUGCUCAGUGCCUCCUGGCAUCGGCCAUUGGUUCUUGGAAGCCUCAACUACGGAUUCAUCACUGACCCCGUGGCGCUCACUGGUCAAAGAAAACUAGGAUGCCGUGGAAUGAUGAACACGUUAAUGUUAAUAUGGAACCAUCAUUUCGGCCCCUAUGGUUCAACCCCAAGAUUAGUUUUCGUUUGUGAAGCCAAGCGGCACCGGGGAUCUUGGGCAAACUACACUGAAGCAAAACUCCCUUCCUAUUAUGUAAUAACACUGGCACAGGGUCUUGGCCCGCGCGCUGGGCUCCACCACAACGUGUACUGUCUUCACCCUCAACGAGUUUUCCACUUCUGUCCCUUCGUAUCAGUUCACUUGCAAUUCCUAUCCCAUGUUUCGACUAGCCCAAGCGCUAAGUGUGCCCGCCUAGAUCCAGUCCAUCUUCCGGCUGAGGUGGGGAUCGUCAAACCUGCGGGGCGGAUUAAGAAGUCAUUUGUUGGUGGCGCGGGGCCUCUCAGAAUGUUAAAUAGGCAACGUGUAUGUUCGGUGGGGCCUGGAAGUGGACCGCCGUCCGUGGCGGAUUGUGCCAAAUUAACGGCUGAAGUGGAGUGGACUUCCAUCCACCCAGCUGCAGCAGAUCGGGGGUUAUCCCAAAGCACCAUCCAUGCCAGCAUGAUGCUGACUCACCAAAUAAGCUUCACUGAAUGCGACAAGUUCGCGCAAAUGGCUCAGAGCAGCGUGUCCCACACCGUGGGACAAAGGGUAUACUCGACUUCUCCACCUUGCGCGAAACCUGGCCCCGCUGGAUACAGACUGAUCAGUUCUAUCGAAUGUACCGUGCACAAAUGUAAACGUCGACAUAUGGCCGGCGCGCUACUGCGGCCCCGGGAACCUGGCCUCCUACCCGAUGACAAUGUAUCACCCGUCCCUCUCCGGUACGGCGAUAAUAUAUUGGCUCAUCGGGUGGCAUCUUACUCCCGGCGUACUUCCGACCCGUCGCAUCAAGUCCGAUCUGACCAAUUCUGGGACAUUAAUGUACAACCACCUAUACCCUUCUUCGCACCUCUGCUGAAUUUGGCUUCACGAACCUAUGGGCGAGGAGCGCUGCUGUCCCCGCCGGAACCACAGAUUCACGCUGCCACUAUGGCUUCAGCUAGAUGUGAGUCAAAUAAUAGAUCAGUACUCGUUAUGCGGCAUGAUCAUGAAGGUAAACUGCCCUUGCACCGAUCCAAGCUAAGCGGGCUAGCUGUAAUCCUUAGCCGGGGAUCUUCCGAUGUAUGUGCCCCCUCGGACAUGAAACACAUCCACAGUGGAGAUAGACAAAUGACUGAGGAGCUUAGAUUUCUGGAGAACAAAAACUUGAUGGGCUUAAGAUAUGGUCUAUACUCAUUAACAUCGAGAUGUGCUCGAAACGUCGAUAGACUCAUUCCUUUUAUUCGCCUACAGCAAGUGUUCGGGGAAUCAAAGUUGGAGUCACUUGCCCCAGGGGUCAAGCCGCUCCCGAUUUUCGUCGAGCGUCGUAGGAUGUGGCCGCCGGUUAUAUGGAUAAGUAUACGUUGCGGACACCAGACCAGACCCUAUAUACGAGACCGUUCUGCAGCUAAAUGUCGGGGGGGCCAGUCGCGGCCCGCCCUCUCUAAACAACUUAUUUACGUUCGGCGGGUAAGGCAGUGGCGGUUACAUCCAGGCAGACAGAUGGUCCUUGGUCAUACGUUCGCGAGCUCUUUCCGUCAGGAACUCUCCGCACAGCAUACUGCAACUCGCCGGAUUACAAGACCCCUUAGUGCUCCCUUUUAUGUACGUCCCCGGCCCUGGACUGGCGGUACUGUCGAGCUUUGCAUUUUUAGAGGCGCCUCAUGCAGGACUUCAGAAUUCGGCAAGGGAGCUACCCCCAAAGAGCUCCUCGUAAUGAACGGGUUCCUAGUGGUGUAUUACCCAGCCGGACAAAGGCCCGGUCUAACGUCUUUUGUCCGUUCGCAUUCCAUACGUCCCGUGUACGCCGAGCUACUCGGUAGUGAAACUAGGCGAGACUUGCGGAGGUCUUUUUGGUCAGUAAACGUAGUACUUGGUGUAUAUCGUCACUUACGCCACGGCACAAGGCAAAGGAGUGCGUCAUCCGGAUUGAAGGGCACUCUCAAGGUUGAUUCGCCAAUGGGUGUUGUUCGUCGCAAACCGAACCCGAUCCACUUUUUACCCUGGAAAGGGGUGUCAAGGGCGGACUUCGUGGCUCUAUCCGUCCAUGGAGUAUACUCGUCCUCAGUAAGUAGUGUAGGAUGGUUCACCGGAUGGAAAGGUAACGUUAAAAGACCGCUUCGUUGUUUAAUUGCGCAAGACUUCAAGUGCUCGAGCUUAGGUCUUCCCAUUAUGUUUAGGGAUGUAUUCUCACAAAUGCCUUAUUGUAGAUUGAGACAAGCUCCAUACGUAGUAGCACCCUUUGACUCGGGCGUUCUAUGGAUAGCUCGCAAGACGUGGAUCGCAUUCAGUCACUUACGAAAAUCCAGAUUCUGCCCUGCCUGGCUGUCAACAGACAACACCUUCGAUCAAUACGGAUCUAUCUUGGUGAGCGAAUUUUCUCCCACCCCGCGGGGAAUCGCACUGGUGGUCUGUGUGCCCCGAUCCAUUGUCUGCCGGAGCCACGGGAAAAAUUUUAAAUUCUGUAUCCUACUCCCCCGUGUGGCUGUAGCCCAGCUGAGGUCAGUAUGUCACCUUGUCGCUAUUAGGUGUUUCACCAUCCUAAUUGGCAAACUGUUUCAACCCUGCCAGAUAAGGUCAGAGCAGCCCCUUCGCUGGUAUUUAUCCCACAGCCCCCCUUCGAAGCGUUCCGCUAAGGCAAUACCAGCUCCGUACAGAGCGCCGGGUACCUUCCUCAUCUACUCCUGGAUCUACUUCUUACUUUGUAGGUCCACGGAUCAAGGCUGUUACUUUUGCAUAGUUCAUCGUGCCAUUACGCAGAGGACUGGAUGUCCCAGAAUACUUCUUGGAUUCACACUUGUCUCAAAUGAGCUUACGGUGGCGCACGGGAUUCAAGCUCCCGUGUUAGAGCCUCGGGCGCUGCCGUACAAUAGGGCAACUCCCAGAACCGAUCACGGAGUUUCUCCGGUGCGUAGACGUAGGUGCAGUAAUAUUCCUAUAAAUGUUGGAGAGUACCGCUGGUUGUUUACUUUUUCGGUAUGCAUACCUACCGACAGUCGCAAGGCAGUACAUGCCACGCAAGUUAGUUGUUUAAUGGUUUUGCCGCGCACAGCUCGUGCCUAUCAUAGGGUAAGGUACACCAGCUUCGGGCUUGCUUCUGAGCAGACCCAAACUAUUUUUCUGAUCCACAUAUCAUCAGACAACAAUUUUGCUCGAAAAGUAUGCAUACCCCCAUUAGUCCUUCUCUGA

Output:

MRPWSLLGSEHILSRRVEGITHDISLYWIPFFSVQVDHLATGLSKIYSAMFLYVTFSAEVAVYHVKVDGSLTTSDACRENSIHHACMGSAHLQRHRQRTDRPPFLSDGKPRSNTEQSPTPSYRLTPRLYSPLTALSGKLYLLGSGCPWKCRKMAQTTIVYRARRWIPLITDTIICVAPLPQPNHGVVALAVPSRARPHCLVRLSQGPSNNVYRYNFTWYCPDGGTADPLPFRHGITSVYLPSYSGIVRSTPYLIGTYAVPTQNSDPFATTRWVSVRLLASTTGEGDTGDRGTLSTFLDCCMSTSALPPARFISAYRVNATHGDDTRLTVKKLCTPYKSLWSGNVCRPLSVYKLKERYIVLTVGYHSLLSRMSTLRKTYSVDQAGPARPLVAEKSGVCECDYDPRFVIVIATVHFGKATGLHSKADRCSRWVGSSGRVEAAQLHHQRNKKPTGRDSDAEKMSGKGRLWSQVRLGGLEIQIGRRYQFYEYFLGKLIIRQRPTHERTQGAKKPSQKGTRLATRMALAWCDRFGRIYIPQCNILVHTIMKVRLHQTACDDNTWTAGEYDLYDCTRDVPNIVLSLPHHLYELLVSDALPAPHLLFLGESGSARHRTRSVGLTIANYTIIRDRCRSTCIRLDEPNPYRRFDVLWPLLMTPARNTQTRAFLCSVAGWNCQYYRPPDRSSSRTYLIALHLAIKLRSRYPNRSDLAYPTSVNRNTVYITVVSLRTAKLRYNSYTPSKLRPDQGNDPSYRTSERGNFVRNLPSVKPYRDFMKTISISFTGFRTKFDRQIGNSIGRGFTGARPTSLKRHSRFSLTVHSSKRYLSRLNAYVSFTIKHRITRFDVATREVKASAVVPNAEIVRKSTKVCWFMCIIRLQTVRATKPTIQKQLLRLSGPFQCGDSTNYVQPGYFHSSNAPRPACVSVCISPGLWDLLVKTRNAFSRVHGGTILTLVQHDIHKVELSSACTRERATNLAMTESVTSYSQCEASTRHTEIQAVSSIVYLHLTAARREKHTEKRADAKHHVSTWREGKTENVIGRLRSSHTLTLRLHPSSLDNWPFILGECQRGTDIEERIPAHAECTDKAVGVAFQSTLWADSANPRGGSRLRRGIRGPNAMNIECGYYLARQLLDRSCSRKIGETLRQTSSRTPLPCKRGRVPKPLEPKESNRSGASSVWIPVGVRLGPSAAKTPPWRHGRPRQLLISPQVIPLRHPSKRASQRDQCELPSCPEYKTPVCRLALGSSRMVHELALKMLSPVPEFVWRVGGGKVYLTADPPRVNLTHMSEHALVVPGVSLWALFLLRPLFFHLQPRLSTTYRWRRHLCLPVQLHSYRLGDMQLGASRRWVGPRNIWRQGVYAWEIYEIRTVPAPRVSLFRRWKENTYTLFGSGEITANVKTAMYRITSHPFRLYAGAREFSPFRLNEKKFAPAGITYKTGCDYSRSGELCEGRGRKNSFMYHWAALPLHAHKTNSLIDFYTPCNPNAAADMLVRSTEDARARIHCRYWVNNSFCKYICWHSRFLIEPIQKKWCTPIERRRPVINGDVLNGSEVTTKTRCCFRWASHTGRSYGRDRANTNLLVMGDASPEGGANRRLASTTGGFVQFKVYISRGDPGKELPYITRISPGRIRARRSFRLMCAVNELVPEDGFTHRRQSTTPPSRSVCDGPVRFRIKTHFQTSTGWGKHWSSFQCDQNCSRSLAYFKQEVTVCGARPGQGSFLPLGLVNDGGWIVIHSERLAVPAYDGIGDLVSDSKSNSMRRGDTYLEVLIRAKRREPISKCASRGALSSHDRGHSLVSTGTHFHILRGLMGIRTIRLSGSRDPTVRTSREGCQAPHFMVQSVWKPTTLRGSPALDNANESNSRPAHNKGRGPSQSNRRTGNVRQVVVGRVTLSQEINPFVKHLELVPGYYLAEYPMPRSLASRSNLRVIHTSHERARQTIHSPGKRNRGASHRTPAGKHREYPRQNSCLDYYEPSIRRKEAYGCVNNALPDCPDKDDREWTRSQSMIEMSRPTESLLSASWHRPLVLGSLNYGFITDPVALTGQRKLGCRGMMNTLMLIWNHHFGPYGSTPRLVFVCEAKRHRGSWANYTEAKLPSYYVITLAQGLGPRAGLHHNVYCLHPQRVFHFCPFVSVHLQFLSHVSTSPSAKCARLDPVHLPAEVGIVKPAGRIKKSFVGGAGPLRMLNRQRVCSVGPGSGPPSVADCAKLTAEVEWTSIHPAAADRGLSQSTIHASMMLTHQISFTECDKFAQMAQSSVSHTVGQRVYSTSPPCAKPGPAGYRLISSIECTVHKCKRRHMAGALLRPREPGLLPDDNVSPVPLRYGDNILAHRVASYSRRTSDPSHQVRSDQFWDINVQPPIPFFAPLLNLASRTYGRGALLSPPEPQIHAATMASARCESNNRSVLVMRHDHEGKLPLHRSKLSGLAVILSRGSSDVCAPSDMKHIHSGDRQMTEELRFLENKNLMGLRYGLYSLTSRCARNVDRLIPFIRLQQVFGESKLESLAPGVKPLPIFVERRRMWPPVIWISIRCGHQTRPYIRDRSAAKCRGGQSRPALSKQLIYVRRVRQWRLHPGRQMVLGHTFASSFRQELSAQHTATRRITRPLSAPFYVRPRPWTGGTVELCIFRGASCRTSEFGKGATPKELLVMNGFLVVYYPAGQRPGLTSFVRSHSIRPVYAELLGSETRRDLRRSFWSVNVVLGVYRHLRHGTRQRSASSGLKGTLKVDSPMGVVRRKPNPIHFLPWKGVSRADFVALSVHGVYSSSVSSVGWFTGWKGNVKRPLRCLIAQDFKCSSLGLPIMFRDVFSQMPYCRLRQAPYVVAPFDSGVLWIARKTWIAFSHLRKSRFCPAWLSTDNTFDQYGSILVSEFSPTPRGIALVVCVPRSIVCRSHGKNFKFCILLPRVAVAQLRSVCHLVAIRCFTILIGKLFQPCQIRSEQPLRWYLSHSPPSKRSAKAIPAPYRAPGTFLIYSWIYFLLCRSTDQGCYFCIVHRAITQRTGCPRILLGFTLVSNELTVAHGIQAPVLEPRALPYNRATPRTDHGVSPVRRRRCSNIPINVGEYRWLFTFSVCIPTDSRKAVHATQVSCLMVLPRTARAYHRVRYTSFGLASEQTQTIFLIHISSDNNFARKVCIPPLVLL

PROT.rb:

def abbreviate(str)
 list = ""
 str.scan(/.../) do |sub|
 case sub
 when "UUU", "UUC"
 list += "F"
 when "UUA", "UUG" 
 list += "L"
 when "UCU", "UCC", "UCA", "UCG", "AGU", "AGC"
 list += "S"
 when "UAU", "UAC"
 list += "Y"
 when "UGU", "UGC"
 list += "C"
 when "UGG"
 list += "W"
 when "CUU", "CUC", "CUA", "CUG"
 list += "L"
 when "CCU", "CCC", "CCA", "CCG"
 list += "P"
 when "CAU", "CAC"
 list+= "H"
 when "CAA", "CAG"
 list += "Q"
 when "CGU", "CGC", "CGA", "CGG", "AGA", "AGG"
 list += "R"
 when "AUU", "AUC", "AUA"
 list += "I"
 when "AUG"
 list += "M"
 when "ACU", "ACC", "ACA", "ACG"
 list += "T"
 when "AAU", "AAC"
 list += "N"
 when "AAA", "AAG"
 list += "K"
 when "GUU", "GUC", "GUA", "GUG"
 list += "V"
 when "GCU", "GCC", "GCA", "GCG"
 list += "A"
 when "GAU", "GAC"
 list += "D"
 when "GAA", "GAG"
 list += "E"
 when "GGU", "GGC", "GGA", "GGG"
 list += "G"
 else
 return list
 end
 end
end
user_input = gets.chomp
abbreviate(user_input)

Yea, that's a very long switch.

Basically it's a translator. Take 3 characters, output 1 other. I've thought about implementing this using a key-value map, but that wouldn't solve the repetitiveness.

The readability is quite good and so is the speed. However, I'm quite sure it isn't idiomatic. I have no clue how this would score on maintainability.

There's one thing striking me as odd: return should be implicit. But simply stating list instead of return list modifies the behaviour and I'm not sure why.