import sys

sys.setrecursionlimit(10 ** 8)

input = sys.stdin.readline


def main():
    S = input().strip()

    ans = []
    for i, s in enumerate(S):
        if ord(s) - ord('A') >= (i + 1) % 26:
            ans.append(chr(ord(s) - (i + 1) % 26))
        else:
            ans.append(chr(ord('Z') + 1 - ((i + 1) - (ord(s) - ord('A'))) % 26))

    print("".join(ans))

    
    

if __name__ == '__main__':
    main()