#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;
}