fcn j(n,k){
   reg p=[0..n-1].walk().copy(), i=0, seq=L();
   while(p){
      i=(i+k-1)%p.len();
      seq.append(p.pop(i));
   }
   "Prisoner killing order: %s.\nSurvivor: %d"
   .fmt(seq[0,-1].concat(","),seq[-1]);
}