#include<stdio.h>
int main()
{
    int m, n;
    if(scanf("%d %d",&m,&n)!= 2)
    return 0;
    if(m<0 || n<0){
        printf("-1\n");
        return 0;
    }
    if(m==0 || n==0){
        printf("\n");
        return 0;
    }
    int total = m*n;
    int mat[m][n];
    for(int i = 0;i < m;i++){
        for(int j = 0;j < n; j++){
            scanf("%d",&mat[i][j]);
        }
    }
    int top =0,bottom=m-1;
    int left =0,right=n-1;
    int printed=0;
    while(top<=bottom&&left<=right){
        for(int j=left;j<=right&&printed<total;j++){
            printf("%d",mat[top][j]);
            printed++;
            if(printed<total)printf(" ");
            }
            top++;
            for(int i = top;i <= bottom && printed < total;i++){
                printf("%d",mat[i][right]);
                printed++;
                if(printed<total)printf(" ";)
            }
            right--;
        }
        if(top<=bottom){
            for(int j=right;j>=left&&printed<total;j--){
                printf("%d",mat[bottom][j]);
                printed++;
                if(printed<total)printf(" ");
            }
            bottom--;
        }
        if(left<=right){
            for(int i=bottom;i>=top&&printed<total;i--){
                printf("%d",mat[i][left]);
                printed++;
                if(printed<total)printf(" ");
            }
            left++;
        }

    }
    printf("\n");
    return 0;
    }