Given the task definition and input, reply with output. 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: Matt met a man named Fred. Sentence2: They talked a lot and became good friends. Sentence3: They went everywhere together. Sentence4: Then Fred betrayed Matt. Sentence5: Matt was upset and decided to never talk to Fred again.
Matt, Fred