str_list = list("ABCDEFGHIJKLMNOPQRSTUVWXYZ")

def main():
    S = input()
    i = 1
    for s in list(S):
        print(get_str(i, s), end='')
        i += 1
    print()

def get_str(index, value):
    value_index = str_list.index(value)
    result_index = value_index - index
    if result_index < 0:
        result_index += 26
        if result_index < 0:
            result_index += 26
            if result_index < 0:
                result_index += 26
        return str_list[result_index]
    else:
        return str_list[result_index]

if __name__ == '__main__':
    main()