buoi 2 - bai 2
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s = "mY namE Is CuoNg, I'm 24 yearS OLd"
s1 = ""
for x in s:
if x.islower():
x = x.upper()
elif x.isupper():
x = x.lower()
s1 += x
print (s1)
Python
INFO
buoi 2 - bai 2
Python
INFO