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.
Input: Sentence1: Ann took her dog for a walk. Sentence2: Suddenly, her dog started to bark at a bush. Sentence3: Ann peeked into the bush to see what he was barking at. Sentence4: She was shocked to find a box with newborn kitten in it. Sentence5: Ann took the kittens to the vet to make sure they were healthy.
Output:
Ann, The vet, Ann's dog, The kittens