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.
Q: Sentence1: Our teacher called on us to present. Sentence2: We introduced ourselves and began talking about our project. Sentence3: Since Dan didn't do much of the project, he froze up. Sentence4: When he was asked to address a certain question, he was confused. Sentence5: The class felt extremely awkward.
A:
Dan, Our teacher, Class