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: Consider 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.

Output: Player, Coach

Input: Consider Input: Sentence1: Riley had always enjoyed playing board games. Sentence2: One day he decides to play chess with a friend. Sentence3: It was a difficult game. Sentence4: In the end, Riley lost the chess game. Sentence5: However, he still loved board games.

Output: A friend, Riley

Input: Consider Input: Sentence1: Barry has a grand garden in his backyard. Sentence2: Barry noticed a lot of fruits were ready to be picked. Sentence3: Barry got his basket and picked apples from the tree. Sentence4: Barry realized he had more fruit than he can personally eat. Sentence5: Barry decided he would give some of his fruit to his neighbors.
Output: Neighbors, Barry