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: Rina had never been to the dentist as a child. Sentence2: Now she was 25 and her teeth hurt her constantly. Sentence3: Finally she scraped up some money and courage and went to a dentist. Sentence4: To her surprise, he was kind and very helpful! Sentence5: He worked out a payment plan to fix Rina's teeth!
[EX A]: Dentist, Rina

[EX Q]: Sentence1: Leanna was the smartest student in her class, nothing was hard. Sentence2: She grew to become a conceited person based on her academical prowess. Sentence3: She loved that many of her friends were jealous of the attention. Sentence4: One day her best friend caught her cheating and told everyone. Sentence5: Her reputation was forever ruined and she wasn't considered smart.
[EX A]: Her best friend, Her friends, Leanna, Class

[EX Q]: Sentence1: A cop car with it's siren on approached Gary. Sentence2: Gary had to park on the side of the road. Sentence3: The cop walked to Gary. Sentence4: He asked if he had a lighter for his cigarette. Sentence5: Although Gary was confused, he lent a lighter to him.
[EX A]:
Cop, Gary