1 #include <cstdio>
 2 #include <cmath>
 3 
 4 int n,m;
 5 
 6 int main()
 7 {
 8     while(scanf("%d%d",&n,&m), n){
 9         for(int num = (int)sqrt(m*2.0); num>0; --num){
10             int numa1 = m-num*(num-1)/2;
11             if(numa1%num == 0)
12                 printf("[%d,%d]\n",numa1/num,numa1/num+num-1);
13         }
14         printf("\n");
15     }
16     return 0;
17 }