Q: 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: Henry was tired. Sentence2: But he had to finish his homework. Sentence3: He stayed up until 4 AM to finish it. Sentence4: But the next day, his teacher forgot to collect it. Sentence5: And Henry did not want to upset the class by reminding her.
A:
Teacher, Henry's class, Henry