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: When tom went to his friends, he loved the food. Sentence2: He needed the recipe for the sauce. Sentence3: So he went home and made it himself. Sentence4: When he did though, it tasted bad. Sentence5: Tom didn't know what he did wrong.
Output:
Tom