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: 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.
Extras, Friends, Shelly

Sentence1: Nell was supposed to sell candy for a school fundraiser. Sentence2: She procrastinated because she hated going door to door. Sentence3: The day before the fundraiser ended, Nell broke her piggy bank. Sentence4: She counted enough money to buy a few boxes of candy. Sentence5: Sick to her stomach from candy, Nell turned in the money.
Nell

Sentence1: A boy in class found a rubber band on the floor. Sentence2: He stretched it across his fingers like a gun. Sentence3: The boy threatened his teacher with his rubber band. Sentence4: The teacher held her ground and did not flinch. Sentence5: The boy shot the teacher and the teacher caught it.
Boy, Teacher