def main():
    s = input()
    for i,j in enumerate(s):
        i += 1
        if i > 26:
            i %= 26
        if ord(j) - i < ord('A'):
            print(chr(ord('Z') + 1 - (ord('A')+i-ord(j))), end='')
        else:
            print(chr(ord(j) - i), end='')
    print()
    
if __name__ == '__main__':
    main()