#include<stdio.h>
int main()
{
    int n,m;
    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++;n;
        }
    }