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