#include<iostream>

using namespace std;

int n, b, h, p;

int main()
{
    freopen("sticks.in", "r", stdin);
    freopen("sticks.out", "w", stdout);
    cin>>n>>b;
    for(int i = 0; i < n; i ++)
    {
        cin>>h;
    }
    for(int i = 0; i < n; i ++)
    {
        cin>>p;
    }
    cout<<n<<endl;
    for(int i = 0; i < n; i ++)
    {
        cout<<1<<" "<<i + 1<<endl;
    }
    return 0;
}