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: William moved into his first apartment one day. Sentence2: He did not have any furniture and needed to get some. Sentence3: He looked online and found a man giving away free furniture. Sentence4: He drove to the man's house and happily took the new items. Sentence5: When he got home, he furnished his house and it looked great.
Example Output: William, A man

Example Input: Sentence1: August was running around the house, chasing his brother. Sentence2: At the same time, August was clutching a pair of scissors in his hand. Sentence3: August's mother soon caught them in the act. Sentence4: When she noticed the scissors, she became angry. Sentence5: August was sent to his room.
Example Output:
August, Mother