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

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

 # converting to ascii value int value and checking to see if char is a capital
 # letter if it is a capital letter it is getting shift by 32 which makes it a lower
 # case 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()