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: 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.
[EX A]: Grandpa, Lucy, Kind stranger, Officer

[EX Q]: 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.
[EX A]: Extras, Friends, Shelly

[EX Q]: Sentence1: Paul took his son to school. Sentence2: But he forgot to give him a lunch. Sentence3: So his son shared food with his friend. Sentence4: But the food made him sick. Sentence5: And Paul never let his son eat school food again.
[EX A]:
Paul, His friend, His son