#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<=b0ttom && left <= righjt)
    {
        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]);
            }
        }
        if(left <= right)
        {
            for(int i = bottom; i>=top;i--)
            {
                printf("%d",matrix[i][left]);
                left++;
            }
        }
    }
    return 0;
}