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