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: Sam was making homemade fries for the first time. Sentence2: He had stepped out of the kitchen when he smelled smoke. Sentence3: He ran into the kitchen and saw an oil fire. Sentence4: He remembered to smother it instead of using water. Sentence5: Luckily, the fire was subdued and didn't make too much damage.
Example Output: Sam

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: We have an old stray cat that hangs around our house. Sentence2: We will sometimes feed it. Sentence3: The other day it was moaning and crying a lot. Sentence4: We went out to see if it was hurt. Sentence5: She was laying outside with a litter of kittens.
Example Output:
Litter of kittens, Stray cat