#include <iostream>

    using namespace std;

struct point {int x; int y; int ext;} myset[100];

int sarrus(int x1, int y1, int x2, int y2, int x3, int y3)

{

    return x1 * y2 + x2 * y3 + y1 * x3 - x3 * y2 - x1 * y3 - y1 * x2;

}

int main()

{

    int n; cin >> n;

    for (int i = 1; i <= n; i++) 

        {

            cin >> myset[i].x >> myset[i].y;

            myset[i].ext = 1;

        }

// generare 3-unghiuri

    for (int i = 1; i < n - 1; i++)

        for (int j = i + 1; j < n; j++)

            for (int k = j + 1; k <= n; k++)

                for (int h = 1; h <= n; h++)

// verificare punct [h]                

                    if (h != i && h != j && h != k && myset[h].ext)

                    {

                      int d1 = sarrus(myset[i].x, myset[i].y, myset[j].x, myset[j].y, myset[h].x, myset[h].y);

                      int d2 = sarrus(myset[j].x, myset[j].y, myset[k].x, myset[k].y, myset[h].x, myset[h].y);

                      int d3 = sarrus(myset[k].x, myset[k].y, myset[i].x, myset[i].y, myset[h].x, myset[h].y);

                      if (d1 > 0 && d2 > 0 && d3 > 0 || d1 < 0 && d2 < 0 && d3 < 0 ) myset[h].ext = 0;

                    }

    for (int i = 1; i <= n; i++)

        if (myset[i].ext) cout << myset[i].x << " " << myset[i].y << endl;

}