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: Warren didn't like beets and told his mom repeatedly. Sentence2: But as she never listened, he had some on his plate for dinner. Sentence3: He tried to give them to his dog. Sentence4: The dog sniffed them and walked away. Sentence5: Warren refused to eat the beets as his dog didn't want them either.
Example Output: Dog, Mom, Warren

Example Input: Sentence1: The governor of my state was well liked. Sentence2: Suddenly, it was found out that he accepted some bribes. Sentence3: The state investigated and he was thrown out of office. Sentence4: He also went to jail shortly after. Sentence5: Now people don't like him the way they used to.
Example Output: I (myself), State, Governor, People

Example Input: Sentence1: Pauly grew up in a small town. Sentence2: After high school he moved away for college and then work. Sentence3: Every holiday Pauly would go back to visit. Sentence4: He would see how much the town had grown and his friends had grown ol. Sentence5: It made him both sad and happy to see all the changes.
Example Output:
Friends, Pauly