Given the task definition and input, reply with output. 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.

Sentence1: Joey knows he should eat more healthy food. Sentence2: He decides to look for some fruit to eat. Sentence3: He has a banana in his cupboard. Sentence4: Joey eats the banana. Sentence5: He is glad that he has started eating healthy food.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Joey