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: Anna was sick of her three TV channels. Sentence2: She called the cable company and made an appointment. Sentence3: Then they came to her house and set up her cable. Sentence4: She was excited to check out her new channels. Sentence5: Anna decided she was going to love having cable!
Example Output: Cable company, Anna

Example Input: Sentence1: Robert and his wife took a trip to Bermuda. Sentence2: They were at the beach one day when Robert was stung by a jellyfish. Sentence3: There wasn't anyone around to call for help. Sentence4: Robert remembered what he heard on the radio about jellyfish stings. Sentence5: He scraped the sting with a credit card to help stop the stinging.
Example Output: Anyone, Robert, Wife

Example Input: Sentence1: Jim always walked to school. Sentence2: But one day he heard a dog barking. Sentence3: He looked behind him. Sentence4: And it was a loose dog. Sentence5: Luckily, the owner caught the dog in time.
Example Output:
The owner, School, Jim, A dog