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: The man went golfing with a friend. Sentence2: The man lost all of his balls in the trees. Sentence3: He asked his friend for some balls. Sentence4: His friend did not have any balls for him to borrow. Sentence5: The man watched his friend finish the round of golf.
Friend, Man