Given the task definition and input, reply with output. 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: Harry didn't want to go to class because an oral report was due. Sentence2: In the classroom, the teacher called Harry to give his report. Sentence3: Harry stood at the podium and mumbled the words on his notes. Sentence4: His classmates started to snicker. Sentence5: Harry crumpled his paper and ran out the door of the class.
Classmates, The teacher, Harry