You will be given a definition of a task first, then some input of the task.
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 was on the high school football team. Sentence2: He was a very competitive guy. Sentence3: He decided to inject steroids to improve his performance. Sentence4: He became a better football player. Sentence5: Tom became happier as a result of his stellar football performances.
Output:
Tom