Both Lavar and Malcavar have small troops of the volunteer soldiers at their command. Together the 2 have more than 10 but fewer than thirty soldiers. One day, one of soldiers, Colin, decided to leave Malcavar's troop as well as join Lavar's. This had the effect of making the number of soldiers in each t r o o p the same. Eventually, Colin rejoined Malcavar's troop, but then Draal decided to give his allegiance to Malcavar rather than Laval. Once Draal switched allegiance, both Laval and Malcavar had a prime number of soldiers. How many soldiers did each then have?