#include <iostream>
#include <algorithm>

using namespace std;

//ifstream cin("abc.in");
//ofstream cout("abc.out");

const int N = 200;
int a[N + 1][N + 1], x[N + 1], n;

int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++){
            cin >> a[i][j];
        }
    }

    int cnt = 1;
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++){
            if (i > j && i + j < n + 1){
                x[cnt] = a[i][j];
                cnt++;
            }
        }
    }

    sort (x + 1, x + (cnt - 1) + 1);
    x[cnt] = 1001;
    for (int i = 1; i < cnt; i++){
        if (x[i] != x[i + 1]){
            cout << x[i] << " ";
        }
    }

    return 0;
}