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.

[Q]: Sentence1: Joe imagined getting rich by finding a priceless pearl. Sentence2: He took his boat to an oyster bed and started looking. Sentence3: He tossed the oysters aside when he found no pearls inside. Sentence4: Hours later, Joe had nothing to show for his troubles. Sentence5: His stomach grumbled and Joe thought of the wasted oysters.
[A]: Joe

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

[Q]: Sentence1: Ronald was driving down the road. Sentence2: He saw a young boy hitching for a ride. Sentence3: Ronald picked up the boy. Sentence4: He urged the boy to call his parents on his cell phone. Sentence5: Ronald waited at a diner with the boy until his parents arrived.
[A]:
Ronald, His parents, Young boy