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.

Ex Input:
Sentence1: An asteroid blazed across the sky. Sentence2: It fell to the ground with a soft shock. Sentence3: A man walked by and looked at it. Sentence4: The rock glowed with heat as he reached for it. Sentence5: The man felt the heat and back off until it was cool.

Ex Output:
A man

Ex Input:
Sentence1: Shawn wanted to get a promotion at work. Sentence2: He decided to take night classes to get certifications. Sentence3: He took online classes 3 days a week. Sentence4: When he got his certification he asked his boss for a raise. Sentence5: His boss agreed to the raise.

Ex Output:
Shawn, His boss

Ex Input:
Sentence1: Driving home the other day I saw a sofa on the side of the road. Sentence2: It was in good shape. Sentence3: The weather looked like rainy might be coming. Sentence4: I called a friend with a truck to help me get it. Sentence5: We got it into my house right as it started raining.

Ex Output:
I (myself), A friend