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: Marshall was incredibly nervous and had sweaty palms. Sentence2: He had vomited on his sweater already and practiced in the mirror. Sentence3: The rap battle began and Marshall rapped better than anyone there. Sentence4: Marshall won the rap battle and was awarded a medal. Sentence5: He eventually became famous and was awarded many other medals.

Output: Marshall

Input: Consider Input: Sentence1: Lucy sat at the police station. Sentence2: She'd been lost and a kind stranger brought her here. Sentence3: She sat with puffy swollen tear stained eyes waiting on her grandpa. Sentence4: An officer gave her a soda while she waited. Sentence5: She was so happy to see grandpa when he arrived, she knocked it over.

Output: Grandpa, Lucy, Kind stranger, Officer

Input: Consider Input: Sentence1: Tom started going to a new middle school. Sentence2: Tom was immediately singled out by the school bully, Joe. Sentence3: Joe pushed Tom around, taking his lunch money. Sentence4: Tom decided he had had enough of this abuse. Sentence5: The next day, Tom punched Joe right in the nose!
Output: Joe, Tom