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: Richard had never been to a baseball game. Sentence2: His uncle bought tickets for the two of them to go to a game. Sentence3: He excitedly walked into the baseball stadium. Sentence4: A ball was hit into Richard's direction. Sentence5: Richard caught the foul ball.
A:
Uncle, Richard