#include 
using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;
    int matrica[n][m];
    for(int i = 0; i < n; i += 1) {
        for(int j = 0; j < m; j += 1) {
            cin >> matrica[i][j];
        }
    }
    
    for(int i = 0; i < n; i++) {
        cout << matrica[i][i] << " ";
    }
    
    return 0;
}