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: Fred was going to make sure he didn't end up like his dad. Sentence2: His dad abused his mom and never provided for his family. Sentence3: Fred found a good job and got married. Sentence4: He supported his family and never abused them. Sentence5: Fred was proud of his own accomplishments.
Example Output: His mom, His dad, His family, Fred

Example Input: Sentence1: The car did not want to start. Sentence2: The driver looked around. Sentence3: The driver checked the dashboard. Sentence4: A light was flashing. Sentence5: The car needed new oil.
Example Output: Car, Driver

Example Input: Sentence1: Louie wanted to open a laser tag arena since he was in high school. Sentence2: He got a bunch of his friends together. Sentence3: They all pitched in to build the arena in a warehouse. Sentence4: They worked for months on the project. Sentence5: They finished last summer and now Louie has his dream business!
Example Output:
Friends, Louie