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: Brittany was planning her wedding. Sentence2: She had been planning it for months. Sentence3: She had the dress and cake. Sentence4: She still did not have a venue. Sentence5: Brittany finally had a venue and her perfect wedding.
Example Output: Brittany

Example Input: Sentence1: Cathy loved telling stories about her childhood. Sentence2: Cathy would tell her fondest childhood memories to her kids. Sentence3: Sometimes they would listen intently, and sometimes the would not. Sentence4: There were even times where they would actually laugh at her stories. Sentence5: Cathy was proud to relive her childhood memories with her kids.
Example Output: Cathy, Kids

Example Input: Sentence1: I and my friend Joe wanted to prank our Spanish teacher, Senior Perez. Sentence2: We managed to get a copy of his car key made during our lunch hour. Sentence3: Marty moved his car to a different area of the parking lot. Sentence4: We watched Senior Perez come go out to his car at the end of the day. Sentence5: We laughed at his bewildered expression.
Example Output:
I (myself), Marty, Senior perez, Joe, Friend