#include <iostream>
using namespace std;
const int N = 500;
int n;
int m[N][N];
int row = 0,col = 0,d = 1;

int main(){
    cin >> n;
    for(int i = 0;i < n;++i){
        for(int j = 0;j < n;++j){
            cin >> m[i][j];
        }
    }
    int res = 0;
    while(res < n * n){
        switch(d){
            case 1:
                cout << m[row][col++] << ' ';
                res++;
                if(row == 0)    d = 2;
                else if(row == n - 1)   d = 4;
                break;
            case 2:
                cout << m[row++][col--] << ' ';
                res++;
                if(col == 0 && row != n - 1)    d = 3;
                else if(row == n - 1)   d = 1;
                break;
            case 3:
                cout << m[row++][col] << ' ';
                res++;
                if(col == 0)    d = 4;
                else    d = 2;
                break;
            case 4:
                cout << m[row--][col++] << ' ';
                res++;
                if(row == 0 && col != n - 1)    d = 1;
                else if(col == n - 1)   d = 3;
                break;
        }
    }
    return 0;
}