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: Sam went to his car from the store. Sentence2: He looked for his keys in his pocket. Sentence3: He couldn't find them. Sentence4: He looked around and then looked in the car. Sentence5: He had locked them in there.
Solution:
Sam