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: I brought my son to the doctors. Sentence2: He was so scared to go. Sentence3: He had to get a few shots. Sentence4: He hates getting shots. Sentence5: He cried the whole time.
Example Output: I (myself), Son, Doctors

Example Input: Sentence1: While he was swimming one day, Jim saw something in the water. Sentence2: He wasn't sure what it was, but he knew it didn't belong. Sentence3: He dove underneath the surface. Sentence4: He pulled the object up to the surface. Sentence5: Jim discovered that the object was a bag of rubber clown noses.
Example Output: Jim

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