Post def swap_case(s):

def swap_case(s): b=str() for i in range(len(s)): if ord(s[i])>=32 and ord(s[i])<=64: b+=s[i] else: if s[i]==s[i].title(): b+=s[i].lower() if s[i]==s[i].lower(): b+=s[i].title() return b if name == 'main': s = input() result = swap_case(s) print(result)