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.
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Question: Sentence1: Shelly wanted to make a music video for his new song. Sentence2: He got some friends together and hired a host of extras. Sentence3: They danced on cars that they parked in a city. Sentence4: The video was a moderate success. Sentence5: Shelly saw a slight bump in downloads of his song.

Answer: Extras, Friends, Shelly

Question: Sentence1: My wife hates her job. Sentence2: She is a teacher to sixth graders and she always gets headaches. Sentence3: She complains that they are way to loud and don't listen. Sentence4: She asked the principal if she could teach at the high school level. Sentence5: The principal allowed her to switch to the junior year, she's happy.

Answer: I (myself), School, Principal, Sixth graders, Wife

Question: Sentence1: Sam cut class one afternoon. Sentence2: But later that day, the teacher saw her in the hallways! Sentence3: He sent her to the office with an explanatory note. Sentence4: When the principal saw Sam had cut class, he punished her. Sentence5: He gave Sam two hours of after-school detention.

Answer:
Teacher, Sam, Principal