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: Jasmine opened the small box. Sentence2: Her husband had given her a new ring! Sentence3: It had a huge diamond in the center. Sentence4: She slipped it on and smiled. Sentence5: She thanked her husband with a kiss.
Example Output: Her husband, Jasmine

Example Input: Sentence1: The boy asked for permission. Sentence2: Permission was denied. Sentence3: The boy did it anyways. Sentence4: He got caught. Sentence5: The boy was punished.
Example Output: Boy

Example Input: Sentence1: Mitch was trying to earn a few extra dollars over the summer. Sentence2: He offered to mow his neighbor's' yards. Sentence3: Four of his neighbors took him up on the offer. Sentence4: Mitch mowed their yards once a week. Sentence5: By the end of the summer, Mitch had saved up a couple hundred dollars.
Example Output:
Neighbors, Mitch, Four neighbor