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: Jill was lost in the wilderness. Sentence2: She had been hiking by herself and got separated from the trail. Sentence3: Her boyfriend called the police after not hearing from her. Sentence4: A search team was dispatched to the GPS coordinates on her phone. Sentence5: A helicopter found and rescued Jill near a large tree.
Example Output: Jill, Police, Boyfriend

Example Input: Sentence1: Eric has high functioning autism. Sentence2: For the most part he can function normally. Sentence3: But sometimes he gets very angry. Sentence4: Autistic people handle anger in a different way than most people. Sentence5: The rage is a lot more intense and scary.
Example Output: Autistic people, Most people, Eric

Example Input: Sentence1: Ron was starting a class in the fall. Sentence2: He couldn't find the required text in the campus bookstore. Sentence3: Ron checked online for the book. Sentence4: Two sites had the book. Sentence5: Ron ordered the book from the cheaper site.
Example Output:
Ron