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: Sam's car's electric window stopped working on his side. Sentence2: Sam couldn't afford to fix it at the time. Sentence3: He tried to do it himself but wasn't able to. Sentence4: He would have to drive around without being able to roll it down. Sentence5: It was especially annoying when using drive throughs.
Output:
Sam