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: Susan had a secret crush in class. Sentence2: She wanted to find out if he felt the same about her. Sentence3: She mustered up her courage and wrote a note. Sentence4: While the teacher wasn't looking she passed it to him. Sentence5: He smiled at her and replied back yes.
A:
The teacher, Susan