#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#define DIMINIT 3

int **initializare_matrice(int nl)
{
    int i;
    int **m = (int **) malloc (nl * sizeof(int *));
    if(m != NULL)
        for(i = 0; i < nl; i++)
            m[i] = (int *) malloc (DIMINIT * sizeof(int));
    return m;
}

int **citire_matrice ( int **a, int nl)
{
    int i, j, capacitate;
    capacitate = DIMINIT;
    j = 0;
    for(i = 0; i < nl; i++)
    {
        scanf("%d", &a[i][j]);
        while (a[i][j] != 0 )
        {
            if (j == capacitate - 1)
            {
                capacitate += DIMINIT;
                a[i] = (int *) realloc (a[i], capacitate * sizeof(int));
            }
            j++;
            scanf("%d", &a[i][j]);
        }
        j = 0;
    }
    return a;
}

float medie_linie(int *v)
{
    int i = 0, s = 0;
    while(v[i] != 0)
    {
        s = s + v[i];
        i++;
    }
    if(i == 0)
        return 0;
    return (float) s / i;
}

void bubble_sort(float *v, int nl)
{
    int i, j;
    float aux;
    for(i = 0; i < nl - 1; i++)
        for(j = i + 1; j < nl; j++)
            if (v[i] < v[j])
            {
                aux = v[i];
                v[i] = v[j];
                v[j] = aux;
            }
}

void bubble_sort_matrice(int **a, float *v, int nl)
{
    int i, j;
    float aux;
    int *aux2;
    for(i = 0; i < nl - 1; i++)
        for(j = i + 1; j < nl; j++)
            if (v[i] < v[j])
            {
                aux = v[i];
                aux2 = a[i];

                v[i] = v[j];
                a[i] = a[j];

                v[j] = aux;
                a[j] = aux2;
            }
}

float *vector_medii( int **a, int nl)
{
    int i;
    float *v;
    v = (float *) malloc(nl * sizeof(float));

    for(i = 0; i < nl; i++)
        v[i] = medie_linie(a[i]);
    // bubble_sort_matrice(a, v, nl);
    return v;
}

int determ_pozitie( int **a, int nl, float medie)
{
    int i;
    for(i = 0; i < nl; i++)
        if(medie == medie_linie(a[i]))
        {
            return i;
        }
    return 0;
}

void afisare_linie( int **a, int i)
{
    int j = 0;
    while (a[i][j] != 0)
    {
        printf("%d", a[i][j]);
        j++;
        if (a[i][j] != 0)
        {
            printf(" ");
        }
    }
    printf("\n");
}

float getMaxValueLessThan(float *v, int size, float upperBound)
{
    upperBound -= 0.000001;
    float currentMax = 0.0;
    for (int i = 0; i < size; i++)
    {
        if (v[i] > currentMax && v[i] < upperBound)
        {
            currentMax = v[i];
        }
    }
    return currentMax;
}

void printLinesWithAverage(int **a, int size, float *v, float avg)
{
    for (int i = 0; i < size; i++)
    {
        if (fabs(v[i] - avg) < 0.0001)
        {
            printf("%-10.3f", v[i]);
            afisare_linie(a, i);
        }
    }
}

int main ()
{
    int **a, nl, i, index;
    float *v;

    scanf ("%d", &nl);
    a = initializare_matrice(nl);
    a = citire_matrice(a, nl);
    v = vector_medii(a, nl);
    // for (i=0;i<nl;i++) {
    // 	printf("%-10.3f",v[i]);
    // 	index=determ_pozitie(a,nl,v[i]);
    // 	afisare_linie(a,index);
    // }
    float crtMax = 11.0;
    crtMax = getMaxValueLessThan(v, nl, crtMax);
    while (crtMax > 0)
    {
        printLinesWithAverage(a, nl, v, crtMax);
        crtMax = getMaxValueLessThan(v, nl, crtMax);
    }
    free(v);
    for(i = 0; i < nl; i++)
        free(a[i]);
    free(a);
    return 0;
}