凯撒密码b

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