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s=input()
new_str=""
for i in range (len(s)):
if i.isupper():
new_str+=i.lower()
elif i.islower():
new_str+=i.upper()
else:
new_str+=i
print(new_str)
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# swapcase() method
string = "thE big BROWN FoX JuMPeD oVEr thE LAZY Dog"
print(string.swapcase())
>>> THe BIG brown fOx jUmpEd OveR THe lazy dOG
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s = 'KDnuggets'
print('\'KDnuggets\' as uppercase: {}'.format(s.upper()))
print('\'KDnuggets\' as lowercase: {}'.format(s.lower()))
print('\'KDnuggets\' as swapped case: {}'.format(s.swapcase()))
# Output
# 'KDnuggets' as uppercase: KDNUGGETS
# 'KDnuggets' as lowercase: kdnuggets
# 'KDnuggets' as swapped case: kdNUGGETS