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 got mad at my brother when I was three years old. Sentence2: I grabbed a chair and pulled it up to a pencil sharpener in his room. Sentence3: I methodically sharpened the pencil in the sharpener. Sentence4: I walked over to my brother and stabbed it into his forearm. Sentence5: He had a small piece of lead permanently imbedded in his arm.
Output:
I (myself), My brother