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: Lauren's car was running out of gas. Sentence2: She rushed to the gas station to fill her car up. Sentence3: Lauren accidently left her keys inside the car while she pumped gas. Sentence4: She had to call the police to unlock her car. Sentence5: From now on, Lauren always keeps a set of spare keys in her purse.
Police, Lauren, Gas station