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: Susie and her friends decided to play graveyard. Sentence2: The girls laid down on the field motionless. Sentence3: All the sudden Susie moved. Sentence4: She ended up losing the game first. Sentence5: Susie laughed but wanted to play again.
Example Output: Friends, Susie

Example Input: Sentence1: Randy wanted to become a chef. Sentence2: He started taking classes at the local college. Sentence3: They started him out on learning to make salads. Sentence4: He got so good at making salads he started working at a restaurant. Sentence5: He got so good that people from all over came to eat his salads.
Example Output: Randy, Local college, People

Example Input: Sentence1: An old man got annoyed by all the people who came to his door. Sentence2: He took off his front door and replaced it with a brick wall. Sentence3: When a salesman came to his house he was very confused. Sentence4: The man knocked on the brick wall and waited. Sentence5: He eventually gave up and left to the old man's delight.
Example Output:
Salesman, Salesman, People