Detailed Instructions: 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: Brett went riding on his bike. Sentence2: He was riding on off-road trails. Sentence3: He hit a large bump and flew off the bike. Sentence4: He landed wrong on his arm. Sentence5: Now Brett's arm is injured.
Solution:
Brett