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.

[EX Q]: Sentence1: Carey was very excited to be going to prom with Joe. Sentence2: He was normally a gentleman but he was drinking that night. Sentence3: Carey felt very uncomfortable and asked to go home. Sentence4: Joe got very upset and almost hit her in the face. Sentence5: Carey broke up with Joe the next day and felt good for being strong.
[EX A]: Carey, Joe

[EX Q]: Sentence1: Roger is a secret agent. Sentence2: His watch has a grappling hook. Sentence3: He uses the watch to climb up a building. Sentence4: He steals important documents from a high profile target. Sentence5: Roger receives a promotion for his work.
[EX A]: Roger, Target

[EX Q]: Sentence1: David was whistling in class. Sentence2: The teacher didn't know who was making the noise. Sentence3: She didn't know who to punish. Sentence4: One of the students told the teacher after class that it was David. Sentence5: The next time David whistled, the teacher blamed David.
[EX A]:
One of the students, Teacher, David