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.
Q: Sentence1: Tom fired his rifle into the crowd of protesters. Sentence2: He felt very powerful when they ran and screamed. Sentence3: Tom fired some more rounds, but everyone had fled and no one was hit. Sentence4: The cops hadn't fled, though. Sentence5: They put a permanent stop to Tom's antics with their own guns.
A:
Cops, Protesters, Tom