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: Sam was in her 9th period class. Sentence2: Time went by so slowly. Sentence3: The class was social studies, her least favorite subject. Sentence4: She could not pay attention. Sentence5: She ended up doodling until it was time to go.
Sam