Given the task definition and input, reply with output. 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.

Sentence1: Kelsey was in her apartment. Sentence2: Her roommates were drunk and fighting. Sentence3: One of them grabbed a hot skillet. Sentence4: She flung the oil at the other one. Sentence5: Kelsey was horrified and called the police.
Police, Kelsey, Roommates, One