Bài 2
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| Language | Python |
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| Owner | mr2uang55 |
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| Modified | |
| Visibility | Public |
#Tao string s
s = 'hello anh Long'
#Tao s1 sao cho thuong thanh Hoa, Hoa thanh thuong
s1 =''
for word in s:
if word.isupper():
s1 += word.lower()
else:
s1 += word.upper()
print(s1)
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