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: Joe was very wealthy. Sentence2: He liked to spend his money on frivolous things. Sentence3: Joe decided to buy himself something fancy. Sentence4: Joe purchased a large yacht. Sentence5: He now regrets his frivolous purchase.
A:
Joe