Instructions: 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.
Input: Sentence1: John was taking a math test. Sentence2: John took out his study sheet from his bag. Sentence3: John hid the study sheet from others. Sentence4: John was caught cheating. Sentence5: John got a zero on his test and decided not to cheat again.
Output:
John, Others