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.
Q: Sentence1: Jeff had a big beer belly. Sentence2: He went to the gym to burn it off. Sentence3: When he got home, he ordered a large pepperoni pizza for reward. Sentence4: Jeff weighed himself the following week and saw he didn't lose weight. Sentence5: Jeff didn't realize he needed to also change his eating habits.
A:
Jeff