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: Amy was going to the barn to meet her friend's horse. Sentence2: She had never met a horse before and was excited. Sentence3: Amy went up to the horse. Sentence4: The horse whinnied and snapped at her. Sentence5: Since then, Amy has been afraid of horses.
A:
Amy, Horses, Horse, Friend