Task: Question Answering
Input (English): On the eve of the first day of school, Brady and McKenzie celebrate the day they met and reminisce about the summer, while they watch Brady's favorite movie, Wet Side Story, the 1960s musical film that they got stuck in during the events of Teen Beach Movie. Mack dismisses Brady's fear that their relationship will change when they begin school. Mack then notices she lost the necklace she received while in Wet Side Story's universe. At school, Brady and Mack reunite with their respective friends, Devon and Alyssa, who are surprised by their new relationship due to their opposite personalities. Brady and Mack are surprised by how differently they act at school. Later, in class, Brady is working on surfboard designs, but hides them when Mack asks him what he is doing. Brady becomes defensive when Mack meets a handsome boy named Spencer Watkins. Mack works on a "Save The Beach" dance, despite Brady's attempts to see her. Struggling with a college application, Brady works on a surfboard instead and accidentally forgets about a college fair that he was to attend with Mack, upsetting her to the point that they break up. In the Wet Side Story universe, Lela and Tanner notice Mack's washed-up necklace and journey into the ocean, winding up on the same beach as Mack and Brady, who are still mad at each other. Mack and Brady tell Lela and Tanner that they are in the future, exciting them. Mack and Brady do not tell them they are film characters, choosing instead to show them that the real world is not as great as it seems, in hopes that they will return to their own world. Meanwhile, the characters in Wet Side Story are confused without Lela and Tanner. 
Question: What is McKenzie's nickname?
Output (English): Mack