Definition: 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: Abby, a large golden retriever dog, loved to run in her backyard. Sentence2: She especially loved chasing after the the squirrels in the yard. Sentence3: The squirrels would tease her by running on top of the fence. Sentence4: They would jump from the fence right onto a tree. Sentence5: Abby never caught a squirrel but she sure enjoyed trying to!
Output:
Squirrels, Abby