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: Tom's cat had fleas. Sentence2: It was scratching and acting weird. Sentence3: Tom took it to a veterinarian. Sentence4: The vet prescribed some basic medication. Sentence5: Tom got rid of the fleas easily.
A:
Fleas, Cat, Veterinarian, Tom