Detailed Instructions: 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.
Problem:Sentence1: While rushing a frat, Ivan was arrested. Sentence2: They charged him with being drunk and disorderly! Sentence3: When he awoke the next morning in jail, he was ashamed. Sentence4: The police let him off with a warning, but Ivan had learned. Sentence5: Joining a frat wasn't worth losing his dignity!
Solution:
Ivan, Police