#include<stdio.h>
int main(){
    int m,n;
    scanf("%d %d",&m,&n);
    if(m<=0 || n<=0){
        printf("-1");
        return 0;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]);0
        }
        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;
}