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: Don showed up for his clarinet lesson. Sentence2: He forgot to bring his music. Sentence3: A teacher told him to play some scales. Sentence4: Don really was not ready for that. Sentence5: After that they played some duets with teacher.
Don, Teacher

Sentence1: Zack was always worried about getting sick. Sentence2: And he became so worried about the air that he wore a respirator. Sentence3: He wore it during his entire school day. Sentence4: And he told other students that the air quality was terrible. Sentence5: Zack still ended up getting sick and worried much more.
Other students, Zack

Sentence1: Meg's pals said she needed to start speaking her mind. Sentence2: When Meg's date tried to order for her, Meg remembered their advice. Sentence3: She pointed to an item on the menu and ordered it adamantly. Sentence4: When their orders arrived, Meg looked aghast at her own dish. Sentence5: The waiter said he hoped she'd enjoy her squid.
Meg