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: Abby started second grade. Sentence2: She had a new teacher! Sentence3: Abby brought her an apple to start her year off well. Sentence4: The teacher smiled and said that she appreciated it. Sentence5: Abby was happy she had been so kind.
Teacher, Abby