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.

[Q]: 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.
[A]: Other students, Zack

[Q]: Sentence1: Nell was supposed to sell candy for a school fundraiser. Sentence2: She procrastinated because she hated going door to door. Sentence3: The day before the fundraiser ended, Nell broke her piggy bank. Sentence4: She counted enough money to buy a few boxes of candy. Sentence5: Sick to her stomach from candy, Nell turned in the money.
[A]: Nell

[Q]: Sentence1: Last year, I broke a drinking glass in my bedroom. Sentence2: Because I was tired, I placed it next to my bed. Sentence3: I told my girlfriend I would take care of it in the morning. Sentence4: Within one minute of waking up, I stepped on the broken glass. Sentence5: I had to go to the hospital to get.
[A]:
I (myself), Girlfriend