def input():
    D = input()
    return D


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


def test():
    D = test_input()
    S=''
    for i, s in enumerate(D):
        c = chr(ord(s)+i+1)
        S += c
    print(S)


def solve():
    D = input()
    S = ''
    for i, s in enumerate(D):
        c = chr(ord(s)+i+1)
        S += c
    print(S)


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