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: Kathy didn't like Sue. Sentence2: Kathy started rumours about Sue. Sentence3: Sue found out Kathy was talking about her. Sentence4: Sue and Kathy got in an argument. Sentence5: Sue never talked to Kathy again.
Output:
Kathy, Sue