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.

Example Input: Sentence1: Kelly was out for a jog. Sentence2: She loved jogging in the woods. Sentence3: As she was jogging however, she ended up tripping. Sentence4: When she tripped she skinned her knee. Sentence5: Kelly had to get a band aid.
Example Output: Kelly

Example Input: Sentence1: Barry was excited to take his daughter to the park. Sentence2: However, Barry figured since it was Sunday, it would be empty. Sentence3: Barry certainly guessed wrong! Sentence4: Barry decided to take his child to another nearby park. Sentence5: Barry was glad the park was empty, and he could play with his child.
Example Output: His daughter, Barry

Example Input: Sentence1: Michael raised dogs for dog racing. Sentence2: His favorite dog was getting old and ready to retire. Sentence3: To celebrate Michael set him up for one last race. Sentence4: His dog did a marvelous job and won the race. Sentence5: It made for a great final memory.
Example Output:
Michael, Dogs