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: Sarah starts a new dance class today. Sentence2: Her teacher is very nice. Sentence3: She learned the teddy bear dance. Sentence4: Sarah went home to practice the dance. Sentence5: After practicing, Sarah performed the dance for her family.
Sarah, Teacher, Family