凯撒密码B

s = input()
t = ""
for c in s:
if \'a\' <= c <= \'z\':
t += chr( ord(\'a\') + ((ord(c)-ord(\'a\')) + 3 )%26 )
elif \'A\'<=c<=\'Z\':
t += chr( ord(\'A\') + ((ord(c)-ord(\'A\')) + 3 )%26 )
else:
t += c
print(t)