#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll=long long;

int main()
{
    int n;
    cin>>n;
    int a,b;
    for(int i=0;i<3;i++)cin>>a>>b;
    cout<<4<<endl;
    cout<<a-1<<" "<<b<<endl;
    cout<<a+1<<" "<<b<<endl;
    cout<<a<<" "<<b-1<<endl;
    cout<<a<<" "<<b+1<<endl;
}