Tanner baked a berry pie. The recipe called for 9 ounces of blackberries, 10 ounces of
raspberries, and 12 ounces of strawberries. In the supermarket, he only found 12-ounce
containers of berries. He bought 1 container of each kind of berry. After he baked the pie,
how many ounces of berries did Tanner have left?