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: Jon thought he could catch the biggest fish in the pond. Sentence2: He dug up enough earthworms for that day. Sentence3: Jon walked to the pond but forgot his pole at home. Sentence4: He ran home and grabbed the fishing pole. Sentence5: After three castings, he reeled in the biggest fish in the pond.
Fish, Earthworms, Jon