Nine cats

Once upon a time there were nine cats which wanted nine hundred mice. They tried every day to catch them. Every Monday the mice make a giant wall. The rest of the week, Mice are too fast. To break the wall, the cats have to use a bulldozer. But mice charge home. They zip up their mouse holes. Cats unzip them. Mice run deeper to their beds. Cats make windows with hammers. Mice hammer the cats until only one cat left. He ran home.