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
    return str_list[get_positive_index(result_index)]

def get_positive_index(index):
    if index >= 0:
        return index
    index += 26
    return get_positive_index(index)

if __name__ == '__main__':
    main()