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.

Ex Input:
Sentence1: Eugene was excited to order the new computer on a chip. Sentence2: He watched as the timer on the website slowly counted down to zero. Sentence3: Eugene stared impatiently as it sat there, nothing changing. Sentence4: He found other people on forums who were having the same problem. Sentence5: Eugene seethed that he'd stayed awake for this.

Ex Output:
Other people, Eugene

Ex 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.

Ex Output:
Player, Coach

Ex Input:
Sentence1: Ben's dog Skip was very old. Sentence2: One day Skip got sick. Sentence3: Ben took Skip to the vet. Sentence4: The vet told ben that it was Skip's time. Sentence5: Ben sadly put Skip down.

Ex Output:
Skip, Vet, Ben