Q: 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: Keine thought he was the best at picking the winning horse. Sentence2: One day he bet his entire mortgage on a horse who was sure to win. Sentence3: Keine's friend Joe bet against him. Sentence4: At the third leg of the race, Keine's horse had a heart attack. Sentence5: Now Joe lives in Keine's house, with Keine's ex-wife.
A:
Keine's ex-wife, Winning horse, Horse, Keine, Joe