#include <iostream>
#include <stdio.h>

using namespace std;

int main()
{
    FILE * fp;
    fp = fopen("diff.in","r");
    int n,m,a;
    fscanf(fp,"%i",&n);
    fscanf(fp,"%i",&m);
    int arr[n];
    for(int i = 0;i<n;i++)
    {
        fscanf(fp,"%i",&a);
        if(a == 0)
        {
            arr[i] = -1;
        }
        else
        {
            arr[i] = 1;
        }
    }
    int val[m];
    for(int i = 0;i<m;i++)
    {
        fscanf(fp,"%i",&val[i]);
    }
    fclose(fp);
    fp = fopen("diff.out","w");
    for(int j = 0;j<m;j++)
    {
        a = val[j];
        int x = 0;
        int y = -1;
        int s = 0;
        bool check = false;
        for(int i = 0;i<n;i++)
        {
            s+=arr[i];
            y++;
            if(a > 0)
            {
                if(s < 0)
                {
                    s = 0;
                    x = i+1;
                    y = i;
                }
            }
            else if(a == 0)
            {
                if(s == 2 || s == -2)
                {
                    s = arr[i];
                    x = i;
                    y = i;
                }
            }
            else
            {
                if(s > 0)
                {
                    s = 0;
                    x = i + 1;
                    y = i;
                }
            }
            if(s == a)
            {
                check = true;
                break;
            }
        }
        if(check)
        {
             fprintf(fp,"%i ",x+1);
             fprintf(fp,"%i",y+1);
             fprintf(fp,"\n");
             printf("%i ",x+1);
             printf("%i",y+1);
             printf("\n");
        }
        else
        {
             fprintf(fp,"-1");
             fprintf(fp,"\n");
             printf("-1");
             printf("\n");
        }
    }
    fclose(fp);
    return 0;
}