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.

Input: Consider 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.

Output: Shawn, His boss

Input: Consider Input: Sentence1: A group of five friends met at the local park. Sentence2: One brought a basketball. Sentence3: They all decided to play basketball. Sentence4: Everyone laughed and had fun. Sentence5: It was a fun day everyone remembers.

Output: Five friends, Group, One

Input: Consider Input: Sentence1: Gina's sisters were upset their brothers started a club. Sentence2: Gina suggested they start their own club instead. Sentence3: They decided to try and build something private. Sentence4: But they had no building skills. Sentence5: The shack collapsed before they ever stepped inside.
Output: Brothers, Gina, Gina's sisters