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def reverse_letters(input_str: str) -> str:

"""

Reverses letters in a given string without adjusting the position of the words

>>> reverse_letters('The cat in the hat')

'ehT tac ni eht tah'

>>> reverse_letters('The quick brown fox jumped over the lazy dog.')

'ehT kciuq nworb xof depmuj revo eht yzal .god'

>>> reverse_letters('Is this true?')

'sI siht ?eurt'

>>> reverse_letters("I love Python")

'I evol nohtyP'

"""

return " ".join([word[::-1] for word in input_str.split()])

if __name__ == "__main__":

import doctest

doctest.testmod()