Advent of Code is a series of programming challenges for beginners and experienced Caché programmers.
For an introduction : look at article https://community.intersystems.com/post/advent-code-2016-day1-no-time-ta...
In this challenge, you need to find a password using instructions to move on a keypad.
Instructions can be U(p), D(own), L(eft) and R(ight).
You start at button 5 on a keypad like