#include <stdio.h>
#include <stdlib.h>
#include <gsl/gsl_matrix.h>
int main() {
    int n, m;
    scanf("%d%d", &n, &m);
    gsl_matrix* mat = gsl_matrix_alloc(n, m);
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            int pom;
            scanf("%d", &pom);
            gsl_matrix_set(mat, i, j, pom);
        }
    }
    gsl_matrix* nova_matrica = gsl_matrix_alloc((n + 2) / 2, (m + 2) / 2);
    int ni = 0;
    int nj = 0;
    for(int i = 0; i < n; i += 2) {
        nj = 0;
        for(int j = 0; j < m; j += 2) {
            int maks_sosed = gsl_matrix_get(mat, i, j);
            if(j + 1 < m) { // deka postoi sosedot koj e na desno od momentalnata kelija
                if(maks_sosed < gsl_matrix_get(mat, i, j + 1)) {
                    maks_sosed = gsl_matrix_get(mat, i, j + 1);
                }
            }
            if(i + 1 < n) {
                if(maks_sosed < gsl_matrix_get(mat, i + 1, j)) {
                    maks_sosed = gsl_matrix_get(mat, i + 1, j);
                }
            }
            if(i + 1 < n && j + 1 < m) {
                if(maks_sosed < gsl_matrix_get(mat, i + 1, j + 1)) {
                    maks_sosed = gsl_matrix_get(mat, i + 1, j + 1);
                }
            }
            gsl_matrix_set(nova_matrica, ni, nj, maks_sosed);
            nj++;
        }
        ni++;
    }
    for(int i = 0; i < ni; i++) {
        for(int j = 0; j < nj; j++) {
            printf("%lf ", gsl_matrix_get(nova_matrica, i, j));
        }
        printf("\n");
    }
}
/*
 5 5
 1 7 5 0 4
 2 3 18 -3 5
 14 0 7 5 2
 3 3 4 5 6
 7 0 0 1 2

 *.*/