As you walk up to the village of Phenomenon, a dark figure emerges from the village silhouettes, glistening in the dawn. A metal clad soldier raises a stern voice and utters: “You shall not pass!”. For a split second, you don’t know what to do. As the metal oaf is towering over you, suddenly you realize you have to provide your name and your secret letter/digit combination. If you want to pass the gate and enter the village, that is. What will you do?