#include <iostream>

using namespace std;

int n, m, parcurs[1010][1010], v[1010][1010];

void bordeaza() {
    for (int i = 0; i <= n + 1; ++i)
        for (int j = 0; j <= m + 1; ++j)
            parcurs[i][j] = 1;

    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= m; ++j)
            parcurs[i][j] = 0;
}

void citire() {
    cin >> n >> m;
    for (int i = 1; i <= n; ++i)
        for (int j = 1; j <= m; ++j)
            cin >> v[i][j];

}

int main()
{
    citire();
    bordeaza();

    int x = 1, y = 1, nrParcurs = 0;

    while (nrParcurs<n*m) {
        while (parcurs[x][y] != 1) { // mergem spre dreapta
            cout << v[x][y] << " ";
            parcurs[x][y] = 1;
            nrParcurs++;
            y = y + 1;
        }
        y = y - 1;
        x = x + 1;
        while (parcurs[x][y] !=1){//jos
            cout<<v[x][y] << " ";
            parcurs[x][y]=1;
            nrParcurs++;
            x=x+1;
        }
        x=x-1;
        y = y - 1;

       while(parcurs[x][y] !=1){ //stanga
            cout<<v[x][y] << " ";
            parcurs[x][y]=1;
            nrParcurs++;
            y=y-1;
       }
        y=y+1;
        x = x - 1;

        while(parcurs [x][y]!=1){ //sus
            cout<<v[x][y] << " ";
            parcurs[x][y]=1;
            nrParcurs++;
            x=x-1;
        }
        x=x+1;
        y = y + 1;
    }

    return 0;
}