Q: 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: Ota took her dog for a walk. Sentence2: The dog got away from her. Sentence3: A young boy chased after the dog. Sentence4: He caught the dog's leash. Sentence5: The boy returned the dog to Ota.
A:
Ota, Young boy, Dog