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: Michael bought a computer. Sentence2: He turned it on. Sentence3: He could not figure out how to use it. Sentence4: He called his friend Jeb. Sentence5: Jeb showed him how to use it and he had fun!
Jeb, Michael