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: Lance took his dog to the park. Sentence2: He threw a Frisbee for the dog. Sentence3: The dog ran after the Frisbee. Sentence4: The dog kept running away from Lance with the Frisbee. Sentence5: Lance lost his dog.
Lance, Dog