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: John had never wrestled before. Sentence2: He was convinced to join the tournament by his friends. Sentence3: He didn't realize it was meant as a joke. Sentence4: He wound up surviving longer than expected. Sentence5: Now he thinks it's something he wants to pursue.
Output:
John, Friends