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: My chorus teacher gave me the shirt. Sentence2: We had to have a certain short for choir. Sentence3: My orthodontist's son had the shirt. Sentence4: I called and left her a message. Sentence5: Her son brought it to my school.
I (myself), Orthodontist's son, Chorus teacher, Orthodontist