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: Vincent was driving down the boulevard and listening to music. Sentence2: He looked in his rear view mirror and saw a police officer. Sentence3: The police officer turned on his lights and siren. Sentence4: Vincent had to get out of his car and be searched. Sentence5: The officer was upset after Vincent asked, why did you stop me?
Vincent, Police officer