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 has an English test tomorrow. Sentence2: He has not studied at all. Sentence3: He decided to pull an allnighter. Sentence4: Since he stayed up, he could barely keep his eyes open. Sentence5: He fell asleep during his test and failed.
Joe