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: Don was four years old. Sentence2: He wanted to ride in a baby stroller. Sentence3: He could no longer fit in the stroller. Sentence4: This made him angry. Sentence5: He cried because he does not want to keep growing.

SOLUTION: Don

PROBLEM: Sentence1: Susie was having a costume party. Sentence2: She invited all of her friends. Sentence3: She dressed up as a cat. Sentence4: Her friends loved it. Sentence5: Susie ended up winning the costume contest at the party.

SOLUTION: Susie, Her friends

PROBLEM: Sentence1: Danny was having a tough day. Sentence2: He had dropped his books, broken his bike and lost his phone. Sentence3: Things were beginning to look up. Sentence4: Suddenly, he tripped and hurt his knee. Sentence5: This was Danny's worst day ever.

SOLUTION:
Danny