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: Aaron was an actor in a play. Sentence2: During rehearsal, he forgot one of his lines. Sentence3: He looked up at the stage director with worry. Sentence4: The director gave him a frustrated look. Sentence5: Aaron felt ashamed that he hadn't studied his lines very well.
Director, Aaron