def test_input():
    D = 'ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ'
    return D


def test():
    D = test_input()
    S = ''
    print(ord("A"))
    print(ord("Z"))

    for i, s in enumerate(D):
        S += chr((ord(s)+i-64) % 26 + 65)
    print(S)


def solve():
    D = input()
    S = ''
    for i, s in enumerate(D):
        S += chr((ord(s)+i-64) % 26 + 65)
    print(S)


if __name__ == '__main__':
    # test()
    solve()