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: Joe was bit by a cat when he was very young. Sentence2: Since then, he has always been scared of cats. Sentence3: One day at school, a cat came up to him and played with him. Sentence4: Joe had a lot of fun with the cat. Sentence5: Now, Joe is not scared of cats.
Joe, Cat