Definition: 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: Sentence1: Tom had been at the casino all day. Sentence2: He lost at everything he tried. Sentence3: He had been drinking and was frustrated. Sentence4: He went to the roulette table and bet what he had left on black. Sentence5: He lost that too.
Output:
Tom