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: It was a cool, clear day when Jenny decided to go for a walk. Sentence2: She walked down the sidewalk and straight to her favorite park. Sentence3: While on the walking trail Jenny heard barking coming from the bushes. Sentence4: When she peeked in the bushes she saw the cutest dog she'd ever seen. Sentence5: Jenny took him home and claimed him as her own.
Output:
Jenny, Dog