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R, (削除) 63 (削除ここまで) 62 bytes

-16 bytes thanks to Giuseppe

-7 more bytes, again, thanks to Giuseppe (give him 5 minutes he'll have it down to 50)

-1 byte adding a line break in place of \n

for(l in utf8ToInt(scan(,"")))cat(intToUtf8((l:97)[l>32]),'
')

Try it online!

R, 86 bytes

x=utf8ToInt(scan(,''));s=sapply;cat(gsub(" .+"," ",s(s(x,`:`,97),intToUtf8)),sep="\n")

Ungolfed:

x=utf8ToInt(scan(,'')) #Takes input, converts to ASCII
s=sapply; #Alias sapply function to save a byte
 s(x,`:`,97) #Create vector from 97 to respective ASCII value
 s( ,intToUtf8) #Convert to character
 gsub(" .+"," ", ) #Removes everything after space
cat( ,sep="\n") #Outputs to console

Try it online!

Could likely be golfed.

NOTE: It does not use recursion. I do not know whether that would be shorter or not. I'll experiment later.