#include<stdio.h>
int main(){
    int m, n;
    scanf("%d %d", &m, &n);
    if(m < 0 || n < 0) {
        printf("-1");
        return 0;
    }
    int matrix[m][n];
    for(int i = 0; i < m; i++) {
        for(int j = 0; j < n; j++) {
            scanf("%d ", &matrix[i][j]);
        }
    }
    int top = 0, bottom = m - 1;
    int left = 0, right = n - 1;
    while(top <= bottom && left <= right){
        for(int i = left; i <= right; i++){
            printf("%d ",matrix[top][i]);
            top++;
        for(int i = top; i<= bottom; i++){
            printf("%d ",matrix[i][right]);
            right--;
    }
    if(top <= bottom){
        for(int i = right; i>= left; i--){
            printf("%d ",matrix[bottom][i]);
            bottom--;
        }
    }
    if(left <= right){
        for(int i = bottom; i>=top; i--){
            printf("%d ",matrix[i][left]);
            left++;
        }
    }