Q: 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: John and Joe were having a competition to see who could jump higher. Sentence2: They didn't know who should judge it. Sentence3: After awhile they found someone that should judge them. Sentence4: When they finally started to test it Joe was nervous. Sentence5: Eventually it was decided that John could jump higher.
A:
John, Joe, Some judge