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: Tim's bike was stolen. Sentence2: Tim thought Jay did it. Sentence3: Jay was riding a bike like Tim's. Sentence4: Tim pushed Jay off of the bike. Sentence5: Tim apologized when he saw it was not his bike.
Output:
Tim, Jay