def user(my_string):
    base_ord = ord('A')
    total_chr = ord('Z') - base_ord + 1
    user_string = str()
    for i, character in enumerate(my_string, start=1):
        new_ord = (ord(character) - i + base_ord) % total_chr + base_ord
        user_string += chr(new_ord)
    return user_string

if __name__ == '__main__':
    print(user(input()))