#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; i<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;
    }

}