Definition: 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: Michelle is walking home from the club. Sentence2: While walking she feels someone grab her arm. Sentence3: They turn her around and point a gun at her. Sentence4: They demanded her purse. Sentence5: She gives them her purse and is robbed.
Output:
Michelle, Someone