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: I was on an overpacked bus one day. Sentence2: All the seats were filled. Sentence3: A man wanted to sit and no one would give up their seat. Sentence4: He started to yell. Sentence5: Then he punched the window and broke it!
Output:
I (myself), A man