One day, a kind man named Tom went to the park. He had a wallet with him. In the wallet, there were many small papers with pictures on them. Tom liked to look at the pictures when he felt happy. While Tom was at the park, he saw a big dog. The dog liked Tom's wallet too. The dog took the wallet in his mouth and ran away. Tom was sad and did not know what to do. He wanted his wallet back. Then, something unexpected happened. The big dog came back to Tom with the wallet. The dog was kind too. He did not want to keep the wallet. The dog just wanted to play. Tom was happy and played with the dog. They became good friends.