#include<bits/stdc++.h>
using namespace std;
unsigned long long n, h[1000050], p[1000050];
unsigned long long b;
int main ()
{
   freopen("sticks.in", "r", stdin);
   freopen("sticks.out", "w", stdout);
   cin >> n >> b;
   for(int i=1; i<=n; i++)
      cin >> h[i];
   for(int i=1; i<=n; i++)
      cin >> p[i];

   cout << n << endl;
   for(int i=1; i<=n; i++)
      cout << "1 " << i << endl;
   return 0;
}