number 1

#include <iostream>
#include <string>
#include <math.h>

using namespace std;

struct point
{
    int x, y;
};

int main()
{
    point Lev, Gien;
    int k;
    Lev.y = 1;
    cin >> k >> Lev.x >> Gien.x >> Gien.y;

    while (Lev.y != k)
    {
        if (((Gien.x != Lev.x)||(Gien.y != Lev.y + 1))&&(abs(Lev.x - Lev.y - 1) != abs(Gien.x - Gien.y))&&(Lev.x + Lev.y + 1 != Gien.x + Gien.y))
        {
            ++Lev.y;
            cout << Lev.y << " " << Lev.x << endl;
            cout.flush();
        }
        else if (Lev.x != 1)
        {
            --Lev.x;
            ++Lev.y;
            cout << Lev.y << " " << Lev.x << endl;
            cout.flush();
        }
        else
        {
            ++Lev.x;
            ++Lev.y;
            cout << Lev.y << " " << Lev.x << endl;
            cout.flush();
        }

        if (Lev.y != k)
        {
            cin >> Gien.x >> Gien.y;
        }
    }

}