#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++;
            }
        }
    }
    
        return 0;
    }