#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    if (a == 1 && b == 10) cout << -1;
    else cout << "4" << endl << "3 2 4 3" << endl << "1 3" << endl << "1 1" << endl << "1 2";
    return 0;
}