You will be given a definition of a task first, then some input of the task.
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.

Sentence1: Nat wanted to learn how to ride horses. Sentence2: Because she was from the city, she never had the chance before. Sentence3: However, when she graduated college she decided to finally learn. Sentence4: She moved to New Mexico and got a job on a ranch. Sentence5: Now, she rides horses every day.
Output:
Horses, Nat