Detailed 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.
Q: Sentence1: Gary was walking his dog on the sidewalk. Sentence2: The dog managed to break through the leash and ran away. Sentence3: It ran towards a crowded street with a traffic. Sentence4: A man hit the dog on the side while he was driving. Sentence5: Since he only felt a small thud, he didn't bother to stop.
A:
Man, Dog, Gary