وجود دارد سه کتاب و هر یک از این اعداد بر روی آن. به دنبال تعدادی است که دیده نمی شود به دیگری وجود دارد یکی برای هر کتا
There are three books and each of it has numbers on it. Look for the number which is not seen to the other, there's one for every book. Find those number before the time runs out.