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: Jason was a very smart boy, but he always rushed through his work. Sentence2: If the work was very easy, he would turn it in very fast. Sentence3: Because he worked so fast, he always made mistakes. Sentence4: His teacher talked to him about always rushing, and Jason listened. Sentence5: From then on, Jason never rushed through his work again.
Jason, Jason's teacher