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: Charlie and Susan went on a date. Sentence2: They decided to eat at a nice restaurant. Sentence3: The two ordered a bottle of wine. Sentence4: Charlie ordered food for them both. Sentence5: The couple ate and drank and enjoyed themselves.
Example Output: Charlie, Susan

Example Input: Sentence1: Bobby was downloading music to his computer. Sentence2: He was downloading it from a shady site. Sentence3: Bobby began to have trouble with his computer. Sentence4: He had downloaded a virus. Sentence5: Bobby had to bring his computer to an expert.
Example Output: An expert, Bobby

Example Input: Sentence1: Jake felt he was going bald. Sentence2: He started wearing a cap to hide it. Sentence3: The cap caused friction on his head. Sentence4: This caused more hair to fall out. Sentence5: Jake eventually accepted going bald.
Example Output:
Jake