#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;
}