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: Maddie really wanted a puppy. Sentence2: Her mom told her if she gets all good grades, she could get one. Sentence3: She worked really hard for three months on her school work. Sentence4: When report cards came out, she had earned all a's and b's! Sentence5: Maddie's mom took her to get her puppy as her reward.

SOLUTION: Maddie, A puppy, Her mom

PROBLEM: Sentence1: Riley had always enjoyed playing board games. Sentence2: One day he decides to play chess with a friend. Sentence3: It was a difficult game. Sentence4: In the end, Riley lost the chess game. Sentence5: However, he still loved board games.

SOLUTION: A friend, Riley

PROBLEM: Sentence1: Jake's Dad collects historical model trains. Sentence2: Jake and I were playing ball in his Dad's back room. Sentence3: Jake threw a ball at me and it bounced off the wall. Sentence4: The ball flew into his Dad's back room. Sentence5: Jake broke his Dad's favorite model train.

SOLUTION:
Jake's dad, I (myself), Jake