Instructions: In this task, you're given a story (which contains five sentences only). Your task is to find all the characters which are available in the given story.
Input: Sentence1: Today the pound had a special on pet adoptions. Sentence2: We decided to head down and look for a dog. Sentence3: Our dog had passed away a few years ago. Sentence4: We were ready to bring another pet into our home. Sentence5: It was the last kennel where we found our puppy.
Output:
Pet, Our puppy, The pound, A dog, Our dog