sWAP cASE

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    def swap_case(s): l = '' for i in range(len(s)): if s[i].isupper(): l += f'{s[i].lower()}' elif s[i].islower(): l += f'{s[i].upper()}' else: l += s[i]

    return l
    

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