https://www.acmicpc.net/problem/11655
Code
s = input()
rot_13 = ''
for i in s:
aski = ord(i)
if 65 <= aski and aski <= 90:
aski = ((aski - 65)+13)%26+65
elif 97 <= aski and aski <= 122:
aski = ((aski - 97)+13)%26+97
rot_13 += chr(aski)
print(rot_13)
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