[0,1,2,1,2,1,2,1,2,3,4,-1,4,3,2,3,4,19,2,17,16,15, 2,3,4,5,4,5,6,11,6,5,4,3,4,5,6,19,18,19,18,17,16, 15,14,13,4,5,6,7,6,5,6,9,10,11,10,9,6,5,4,5,6,7,8, 9,10,17,18,19,18,-1,16,15,14,13,12]