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: Ana was riding her horse one afternoon. Sentence2: Then suddenly, something spooked the horse. Sentence3: It reared up and threw Ana off its back onto the ground. Sentence4: Ana landed awkwardly and broke her neck! Sentence5: She had to wear a neck brace for months.
A:
Horse, Ana