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: 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.
Example Output: Manager, Nancy

Example Input: Sentence1: Aaron was a stunt rider at a carnival. Sentence2: He jumped into a metal ball with other motorcyclists. Sentence3: They drove in circles around each other upside down. Sentence4: Once Aaron hit the other motorcyclist and broke his jaw. Sentence5: Now he is more careful but will never quit doing what he loves.
Example Output: Motorcyclists, Aaron

Example Input: Sentence1: On opening night of the play, Fred forgot his lines. Sentence2: Since he had a minor part, it was not a big deal. Sentence3: Fred made up a line on the spot to keep the action going. Sentence4: The audience did not notice his mistake. Sentence5: Fred like the new line so much he used the the next day.
Example Output:
The audience, Fred