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: John was on his boat fishing. Sentence2: A huge storm came and turned over his boat. Sentence3: John was stuck in the water for hours. Sentence4: Finally a boat came and saw him. Sentence5: He was glad to be rescued.
Solution:
John, A boat