You will be given a definition of a task first, then some input of the task.
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 a history test. Sentence2: He has studied all week. Sentence3: However, he still did not feel ready. Sentence4: Joe got to his test and took it. Sentence5: He did much better than he thought.
Output:
Joe