I drop into the black hole when I travel in the universe with my spaceship, suddenly I come to a weird planet in which 4 silly and gray hyenas live. They all have miserable experiences, one with no ear, one with no feet, one with no eye and the last one is extremely fat. I feel sympathy with them and decided to give them food. However, I just brought 3 sandwiches. So, I told the first hyena to hear the sound I make, second one to run very fast, third one to looking for my key and the last one to climb a tree. If they successfully do that, it can get a sandwich. It is really a pity that no one did, so I eat all of the sandwiches.