def lower(word: str) -> str:
 """
 Will convert the entire string to lowercase letters

 >>> lower("wow")
 'wow'
 >>> lower("HellZo")
 'hellzo'
 >>> lower("WHAT")
 'what'
 >>> lower("wh[]32")
 'wh[]32'
 >>> lower("whAT")
 'what'
 """

 # Converting to ASCII value, obtaining the integer representation
 # and checking to see if the character is a capital letter.
 # If it is a capital letter, it is shifted by 32, making it a lowercase letter.
 return "".join(chr(ord(char) + 32) if "A" <= char <= "Z" else char for char in word)


if __name__ == "__main__":
 from doctest import testmod

 testmod()