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: 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!

Answer: Dentist, Rina

Question: Sentence1: Matt's mom promised a surprise for him after school. Sentence2: He was excited all day. Sentence3: So excited that he wasn't paying attention during math class. Sentence4: When he didn't answer when called, he was given detention. Sentence5: Matt would have to wait longer to find out what was his surprise.

Answer: Matt, Matt's mom

Question: Sentence1: An elderly woman was waiting on the side of a street. Sentence2: She placed her feet on the road to start walking. Sentence3: However, a car tried to accelerate. Sentence4: Instead of going further, she placed her feet back. Sentence5: The car slowed down afterwards.

Answer:
An elderly woman