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: Dan wanted to get some exercise in today. Sentence2: Dan decided he would go to the local pool and swim several laps. Sentence3: However, when Dan arrived he noticed the facility was closed. Sentence4: Dan decided he would go back home and exercise there. Sentence5: Dan was disappointed that he could not swim in the pool.
Example Output: Dan

Example Input: Sentence1: A friend of mine is always testing his luck with the law. Sentence2: He rather sell drugs than get a job. Sentence3: The last I heard is he started to traffic across state lines. Sentence4: Yesterday the DEA came looking for him. Sentence5: Later in the evening news he was arrested with drugs.
Example Output: I (myself), Dea, Friend

Example Input: Sentence1: Thomas was at the arcade. Sentence2: He was fairly confident that he could win the crane game. Sentence3: Some kids placed bets on him. Sentence4: Luckily, he did win on the crane game. Sentence5: He ended up earning some good money.
Example Output:
Thomas, Kids