#include <iostream>

using namespace std;

int n, m;
int a[1001][1001];
bool viz[1001][1001];

int main()
{
    cin >> n >> m;
    int x = 0, y = 0;
    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= m; ++j)
            cin >> a[i][j];
    bool ok = 1;
    while (ok) {
        x++, y++;
        ok = 0;
        for (int i = y; i <= m - y; ++i) {
            if (!viz[x][i])
                cout << a[x][i] << ' ', ok = 1;
            viz[x][i] = 1;
        }
        for (int i = x; i <= n - x; ++i) {
            if (!viz[i][m - y + 1])
                cout << a[i][m - y + 1] << ' ', ok = 1;
            viz[i][m - y + 1] = 1;
        }
        for (int i = m - y + 1; i > y; --i) {
            if (!viz[n - x + 1][i])
                cout << a[n - x + 1][i] << ' ', ok = 1;
            viz[n - x + 1][i] = 1;
        }
        for (int i = n - x + 1; i > x; --i) {
            if (!viz[i][y])
                cout << a[i][y] << ' ', ok = 1;
            viz[i][y] = 1;
        }
    }
    if (n == m && n % 2)
        cout << a[n / 2 + 1][n / 2 + 1];
    return 0;
}