sWAP cASE

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    def swap_case(s): return_str = '' for char in s: if char.isupper(): return_str += char.lower()

        elif char.islower():
            return_str += char.upper()
        else:
            return_str += char
    return return_str
    

    if name == 'main': s = input() result = swap_case(s) print(result)