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: Billy had a habit of telling convenient lies. Sentence2: First, he lied to his parents about his report card. Sentence3: Then he lied to his friends to get out of helping them. Sentence4: Billy started noticing others looking at him with disappointment. Sentence5: Billy wondered if it was too late to break his habit.
Output:
Billy, Friends, Parents