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: Raynard forgot to study for a big exam. Sentence2: He failed the test. Sentence3: He begged his teacher for a chance to retake the test. Sentence4: The teacher allowed Raynard to retake the test. Sentence5: Raynard got an A grade on the retake.
A:
His teacher, Raynard