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.

Input: Consider Input: Sentence1: Our family had a collection of Beanie Babies. Sentence2: A friend was supposed to sell a few of them at a yard sale. Sentence3: My brother in particular had several of them. Sentence4: One of his sold for twenty dollars! Sentence5: It must have cost about a dollar to make.

Output: Our family, My brother, Friend

Input: Consider Input: Sentence1: The man apologized. Sentence2: The woman said she accepted. Sentence3: The two talked for a while. Sentence4: The man excused himself. Sentence5: He could tell his company was not wanted.

Output: Woman, Woman

Input: Consider Input: Sentence1: My brother took his brother-in-law in for surgery yesterday. Sentence2: It was day surgery. Sentence3: His brother-in-law has polio and needs crutches. Sentence4: When he was released he was groggy and slow. Sentence5: It took an hour to get him up the stairs.
Output: Brother, Brother-in-law