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: A little girl fell asleep in her classroom due to boredom. Sentence2: The teacher saw her and chastised her for it. Sentence3: She was assigned more homework as punishment. Sentence4: The girl hated homework and learned her lesson. Sentence5: She would never fall asleep in class again.
Girl, Teacher