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: Linda was busy studying for a long test. Sentence2: She did not have time to eat. Sentence3: Her stomach began growling during the exam. Sentence4: But her kind teacher tossed her a granola bar. Sentence5: Afterwards, Linda never forgot to eat before class.

Linda, Teacher