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.

Example Input: Sentence1: Tammy is a lawyer. Sentence2: She enjoys helping people and earning money. Sentence3: A poor client asks her to take her case. Sentence4: She says no. Sentence5: Tammy felt bad for her and helped her anyway.
Example Output: Poor client, Tammy

Example Input: Sentence1: Simon invited his friend Joey over for a play-date. Sentence2: He was looking forward to playing Minecraft with his friend. Sentence3: Right before Joey arrived, the internet went out. Sentence4: Simon tried resetting the router, but it didn't help. Sentence5: Simon and Joey played outside until the router was back online.
Example Output: Simon, Joey

Example Input: Sentence1: Tom applied for over a hundred jobs. Sentence2: No one would hire him. Sentence3: Finally he told one employer that he would work for free. Sentence4: The employer agreed. Sentence5: He liked Tom's work so much that after a week he hired him.
Example Output:
Employer, Tom