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.
Input: Sentence1: Tom's old sofa had a bad smell. Sentence2: He couldn't afford to buy a new one. Sentence3: He tried washing it but it didn't work. Sentence4: Tom bought air fresheners instead. Sentence5: They covered up the smell for a while.
Output:
Tom