题解 | #字符串的反码#用25减去ASCII码就行

s = input()
for c in s:
    if c.isalpha():
        if c.isupper():
            print(chr(ord("A") + 25 - (ord(c) - ord("A"))), end="")
        else:
            print(chr(ord("a") + 25 - (ord(c) - ord("a"))), end="")
    else:
        print(c, end="")