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: Nate didn't know what to dress up as for Halloween. Sentence2: He wanted a costume to impress his friends. Sentence3: He decided to make a robot costume himself. Sentence4: He spent all October making his costume. Sentence5: To his friends' excitement, he won first prize at the costume contest.
Output:
Friends, Nate