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: After failing at employment and education, Mike felt lost. Sentence2: He called his parents for help who told him to move back in. Sentence3: Mike's parents were very worried and decided to send him to therapy. Sentence4: Mike then began to see a psychiatrist a few times a week. Sentence5: After the therapy, Mike began to feel better in life.
Example Output: Mike, Mike's parents, Psychiatrist

Example Input: Sentence1: James found a robber in his house. Sentence2: He decided to get a gun for protection. Sentence3: He didn't know anything about guns, but he didn't care. Sentence4: That night, he heard a noise. Sentence5: He shot into the darkness and ended up hitting his cat.
Example Output: James, Robber, Cat

Example Input: Sentence1: When I was a kid there was a lake near my house. Sentence2: Every afternoon I would go outside and throw rocks into the lake. Sentence3: Sometimes there would be ducks in the lake. Sentence4: My parents would always tell me to be careful and not hit the ducks. Sentence5: I really miss living by that lake and seeing those ducks!
Example Output:
I (myself), My parents, Ducks