#include<cstdio>
#include<cassert>
#include<cmath>
#define DIM 100005
using namespace std;

int N, i;
int A;

struct vect
{
    double x, y;
} v[DIM];


int main()
    {
        assert(freopen("aria.in","r",stdin));
        assert(freopen("aria.out","w",stdout));

        assert(scanf ("%d", &N) == 1);
        assert(1 <= N && N <= 100000);
        for (i = 1; i <= N; i++)
        {
            assert  (scanf("%lf %lf", &v[i].x, &v[i].y) == 2);
            assert (-10000000 <= v[i].x && v[i].x <= 10000000);
            assert (-10000000 <= v[i].y && v[i].y <= 10000000);
        }

        v[N+1] = v[1];

        for (i = 1; i <= N; i++)
            printf("%lf %lf\n", v[i].x, v[i].y);
            //A += (v[i].x * v[i + 1].y - v[i + 1].x * v[i].y);
        //printf("%d", A / 2.0);
    }