In the Las Vegas video, Loki recites the months in the following order: June, January, April, March, May, and February. The months correspond with the list of numbers. For example, June goes with #1. Then, the numbers in each month are the days that should be filled in. The dates connect and May and June's dates form a cube with April and February. At this point, there is a questionmark and an exclamation mark, which is also known as an interrobang. The answer is interrobang.