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.

Ex Input:
Sentence1: Martha sat quietly on the subway as she waited for her stop. Sentence2: An elderly woman boarded the train and held onto the subway rail. Sentence3: Martha felt bad. Sentence4: She stood up and offered her seat to the elderly woman. Sentence5: The woman thanked Martha enthusiastically.

Ex Output:
Woman, Martha, Elderly woman

Ex Input:
Sentence1: Nancy was very unhappy with the customer service she received. Sentence2: She couldn't find a manager to talk to though. Sentence3: Nancy was forced to go home angry. Sentence4: She posted on the company's website about her experience. Sentence5: A manager who saw the post, contacted Nancy to help fix the issue.

Ex Output:
Manager, Nancy

Ex Input:
Sentence1: It was Jane's turn to perform on the talent show. Sentence2: She tried to do a cartwheel and ended up slipping. Sentence3: On her seconds attempt, she landed on her stomach. Sentence4: The audience started to complain about the performance. Sentence5: They ended up throwing their belongings on the stage.

Ex Output:
Jane, Audience