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 hadn't slept well. Sentence2: He was at a big meeting. Sentence3: He felt tired throughout. Sentence4: Tom kept yawning and dozing off. Sentence5: He got in trouble because of it.
Tom

Sentence1: Sam wanted to learn how to read. Sentence2: He thought his friends would mock his illiteracy. Sentence3: But when they found out, they were all very kind. Sentence4: They even volunteered to teach him his letters. Sentence5: After months of studying, Sam became a great reader!
His friends, Sam

Sentence1: I was skateboarding. Sentence2: I decided to skate down a ramp. Sentence3: My board slipped from under my leg. Sentence4: I hit the railing and broke my leg. Sentence5: I realized that I should be more careful when skateboarding.
I (myself)