Once upon a time, there was a smooth rock. The rock could sing a song. One day, the rock met a big bird. The bird was very strong. The rock and the bird became friends. They played together every day.
One day, the bird and the rock found a big wall. The wall was blocking their way. The bird had an idea. The bird said, "I can destroy the wall with my strong wings." The rock was happy. The bird started to hit the wall with its wings.
But, the wall did not break. The wall was too strong. Then, the rock had an idea. The rock started to sing its song. The wall started to shake. The wall broke into small pieces. The bird and the rock were very happy. They could play together again. The rock's song was more powerful than they thought.
