Given the task definition and input, reply with output. 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.

Sentence1: Tom had always wanted to play poker. Sentence2: He was finally able to go to a friend's game. Sentence3: Tom did really well his first time. Sentence4: He had been studying the game for a long time. Sentence5: His friends thought he was cheating.
His friends, Friend, Tom