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: It was Jordan's birthday. Sentence2: His mother was buying him a cake. Sentence3: Jordan's mother bought a strawberry cake. Sentence4: He had wanted a chocolate cake. Sentence5: Jordan had a tantrum about the cake.

Ex Output:
Jordan, Jordan's mother

Ex Input:
Sentence1: The man apologized. Sentence2: The woman said she accepted. Sentence3: The two talked for a while. Sentence4: The man excused himself. Sentence5: He could tell his company was not wanted.

Ex Output:
Woman, Woman

Ex Input:
Sentence1: Val's mom was furious with her. Sentence2: Val liked to her about being bullied. Sentence3: Val was in fact the bully. Sentence4: Her mother was embarrassed when the principal showed her the proof. Sentence5: Val was grounded for a month for being a bully, and telling lies.

Ex Output:
Mom, Val, Principal