N=50;
M=32;
init_finger=[48,13,9,17,40,7,8,26,42,32,18,2,35,36,4,21,44,20,11,25,34,39,23,15,12,1,31,10,27,47,38,16,37,29,33,24,45,50,28,41,46,19,3,43,22,49,14,30,5,6];