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: Jerry knew he wasn't going to do well. Sentence2: He had studied hours for his math exam and still didn't understand. Sentence3: In an act of desperation, he put all the answers into his calculator. Sentence4: He was nervous while taking the test but was very sneaky. Sentence5: He ended up passing the test with a perfect score.

Jerry