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's son wanted to watch a real car race. Sentence2: So Tom and his son went to a famous race course to watch one. Sentence3: It was a 200 lap race. Sentence4: And Tom's son quickly got bored. Sentence5: He felt was embarrassed for wanting to watch the race.
Output:
Tom's son, Tom