Instructions: 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: The teacher was going over the exam that the class have tomorrow. Sentence2: Aaron didn't pay attention and was unaware of it. Sentence3: At home, he mostly slept and didn't do any homework. Sentence4: When he came into class the next day, he was surprised. Sentence5: The teacher passed the exams to everyone and he was scared.
Output:
The teacher, Aaron, Class