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.
Input: Sentence1: Nya was in the restroom at school when the fire alarm went off. Sentence2: Panicked, Nya dropped her hairbrush and ran outside. Sentence3: She quickly found her friends and ensured their safety. Sentence4: Then she waited with her classmates while the police investigated. Sentence5: It turned out the fire alarm had gone off by mistake!
Output:
Nya's classmates, Nya, Friends, The police