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: Kate was bored so she decided to watch TV. Sentence2: She flipped through the channels looking for a show. Sentence3: In her desperation she checked the channels she never watched. Sentence4: The Shining was on TBS. Sentence5: She immediately changed the channel.
Example Output: Kate

Example Input: Sentence1: Ed's dream was to be a published author. Sentence2: He sent in many manuscripts to different publishers. Sentence3: Every time, his work was rejected. Sentence4: He decided to try one last time to get published. Sentence5: On his last try, the publisher finally accepted his work!
Example Output: Ed, Publisher

Example Input: Sentence1: Nancy loved her cats. Sentence2: But she treated them badly. Sentence3: She gave them uncomfortable clothes to wear. Sentence4: And she fed them whatever she ate. Sentence5: Eventually, her cats developed diabetes and died at early ages.
Example Output:
Cats, Nancy