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: A third base coach gave the wrong sign to a player on first. Sentence2: The player ran to steal second base and was almost thrown out. Sentence3: The coach felt in the moment so he told the player to steal again. Sentence4: Once again the player tried to steal a base but was thrown out. Sentence5: That was the third out and the inning was over.
Example Output: Player, Coach

Example Input: Sentence1: Tom was walking home. Sentence2: A small cat started following him. Sentence3: Tom thought the cat was cute. Sentence4: It followed him all the way home. Sentence5: Tom eventually took it in.
Example Output: Cat, Tom

Example Input: Sentence1: Eric was playing his favorite online shooter game. Sentence2: He kept on losing in the game. Sentence3: It was because his internet was too slow. Sentence4: Eric called up his internet company. Sentence5: He purchased a faster internet package for $20 more a month.
Example Output:
Internet company, Eric