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: Jeff thought he was better at ping pong than his sister Jennifer. Sentence2: Jennifer didn't agree so she challenged him to a game. Sentence3: It was a close game all the way until the end. Sentence4: Jennifer beat Jeff by two points. Sentence5: Jeff shook her hand and agreed she was the better player.
Solution:
Jennifer, Jeff