Definition: 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.
Input: Sentence1: Austin was home alone while his parents were at work. Sentence2: He was very hungry, but there was no food left in the house! Sentence3: Austin's parents told him not to go outside by himself. Sentence4: Austin decided to bike to the store and get food anyways. Sentence5: In the end, Austin's parents found out did but not get mad at him.
Output:
Austin's parents, Austin