def sumOfValuesOfCharacters(s: str) -> int:
    return sum([ord(c) - 65 for c in s])


def rotateString(s: str, r: int) -> str:
    return "".join([chr(((ord(c) - 65 + r) % 26) + 65) for c in s])


def mergeStrings(a: str, b: str) -> str:
    return "".join(
        [rotateString(ca, sumOfValuesOfCharacters(cb)) for ca, cb in zip(a, b)]
    )


def decrypt(drmmessage):
    half = len(drmmessage) // 2
    a, b = drmmessage[:half], drmmessage[half:]
    rota = rotateString(a, sumOfValuesOfCharacters(a))
    rotb = rotateString(b, sumOfValuesOfCharacters(b))
    return mergeStrings(rota, rotb)


print(decrypt(input()))