The screening interview took place in the offices in Mexico City. The interviewer asked me about my master's degree thesis and the courses I took during my graduate studies. They also told me about a project they had completed.

The second interview was conducted via webcam and phone conference. It involved a manager from the U.S. and two members of the team I would potentially join. The first part focused on a coding problem (1 hour), and the second part addressed a machine learning problem (1 hour).

You have a rectangular keyboard with letters A to Z. These letters are ordered sequentially from left to right and top to bottom. The number of columns on the keyboard is given by the number N.

Given N and a string S, print the actions you have to make in order to type the string S. The available actions are U (up), D (down), L (left), R (right), and Enter.