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: Vicky wanted to be top of her class. Sentence2: She was smart, but lazy. Sentence3: She decided to cheat on her math test. Sentence4: Her teacher caught her. Sentence5: She failed the class.

Vicky, Teacher