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: Yoojung was the main vocalist of her group. Sentence2: Other members of her group wanted to share singing lines with her. Sentence3: She thought it was not a good idea. Sentence4: In their upcoming concert her voice cracked. Sentence5: She apologized for being contrary to her teammates idea.
Output:
Members, Teammates, Vocalist, Yoojung