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: One day Rowland took the horse out and Penelope, the dog, followed. Sentence2: Rowland rode the horse out to the lonely places. Sentence3: Penelope and Rowland could hear coyotes howling in the distance. Sentence4: When Roland came back, his father asked him, where's the dog? Sentence5: He went out and found Penelope on top of an old rusted car, howling!
Output:
Horse, Coyotes, Dog, Penelope, Rowland's father, Rowland