TASK DEFINITION: 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.
PROBLEM: Sentence1: Lucy sat at the police station. Sentence2: She'd been lost and a kind stranger brought her here. Sentence3: She sat with puffy swollen tear stained eyes waiting on her grandpa. Sentence4: An officer gave her a soda while she waited. Sentence5: She was so happy to see grandpa when he arrived, she knocked it over.

SOLUTION: Grandpa, Lucy, Kind stranger, Officer

PROBLEM: Sentence1: Karen liked a diner in her town. Sentence2: She loved their burgers. Sentence3: The diner changed their recipe for the burgers. Sentence4: Karen didn't like the new recipe. Sentence5: She stopped going to the diner.

SOLUTION: Karen

PROBLEM: Sentence1: Neil was doing a science report. Sentence2: He decided he would write it on the topic of acid rainy. Sentence3: He researched acid rainy and wrote a great paper. Sentence4: He even added a video about the effects of acid rainy. Sentence5: Neil's teachers and classmates loved his great presentation!

SOLUTION:
Classmates, Neil, Teachers