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: Jack wanted to get better at dribbling and decided to do a drill. Sentence2: First, Jack dribbled with his right hand many times. Sentence3: Then, he did the same with his left hand. Sentence4: Lastly, he dribbled with both hands at the same time. Sentence5: When he was done, Jack was much better at dribbling.
A:
Jack