Python:实现reverse letters反向字母算法(附完整源码)

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?')
    &
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