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s1 = []
for item in s:
if item.isalpha():
if item.isupper():
s1.append(item.lower())
else:
s1.append(item.upper())
else:
s1.append(item)
return ''.join(s1)
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sWAP cASE
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s1 = [] for item in s: if item.isalpha(): if item.isupper(): s1.append(item.lower()) else: s1.append(item.upper()) else: s1.append(item) return ''.join(s1)