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: Tim knew he was going to be late for class. Sentence2: His teacher was notorious for docking grades due to tardiness. Sentence3: The class was taking a mid-term exam worth half of their grade. Sentence4: Tim was exactly five minutes late for the exam. Sentence5: The teacher docked Tim's grade one point for every minute he was late.
A:
Tim, Tim's teacher