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 had old tires on his car. Sentence2: They had become slick from too much use. Sentence3: It rained hard one night. Sentence4: Tom hydroplaned several times. Sentence5: Tom finally decided to get new tires.
Output:
Tom