#include <bits/stdc++.h>

using namespace std;

vector<vector<int>> twoDimensionVec;

int n;
//出发点
int row = 0, col = 0;
//初始化方向
int dir = 0;

//变更方向
//0:右
//1:左下
//2:下
//3:右上
void changeDir() {
    switch (dir) {
        //如果原来是向右
        case 0:
            //检查左下是不是可以走
            if (row + 1 < n && col - 1 >= 0) {
                dir = 1;
            } else { //左下走不了，走右上
                dir = 3;
            }
            break;
            //如果原来是1号，即左下
        case 1:
            //优先向下
            if (row + 1 < n) dir = 2;
                //次选横向
            else dir = 0;
            break;
            //如果原来是2号，优先右上
            //否则 左下
        case 2:
            if (col + 1 < n && row - 1 >= 0) dir = 3;
            else dir = 1;
            break;
            //右上
        case 3:
            //优先向右，次选向下
            if (col + 1 < n) dir = 0;
            else dir = 2;
            break;
    }
}

int main() {
    cin >> n;
    for (int i = 0; i < n; i++) {
        vector<int> oneDimensionVec;
        for (int j = 0; j < 4; j++) {
            int c;
            cin >> c;
            oneDimensionVec.push_back(c);
        }
        twoDimensionVec.push_back(oneDimensionVec);
    }

    //第一个位置
    cout << twoDimensionVec[row][col] << " ";

    int count = 0;
    //如果没有到达出口位置
    while (!(row == n - 1 && col == n - 1)) {
        count++;
        if (count == 8) {
            int a = 1;
        }
        switch (dir) {
            case 0:
                //向右横向移动一格
                if (col < n - 1) {
                    col++;
                    cout << twoDimensionVec[row][col] << " ";
                }
                break;
            case 1:
                //向左下角走一个斜格子
                while (col > 0 && row < n - 1) {
                    row++;
                    col--;
                    cout << twoDimensionVec[row][col] << " ";
                }
                break;
            case 2:
                if (row < n - 1) {
                    row++;
                    cout << twoDimensionVec[row][col] << " ";
                }
                break;
            case 3:
                while (col < n - 1 && row > 0) {
                    row--;
                    col++;
                    cout << twoDimensionVec[row][col] << " ";
                }
                break;
        }
        //变更方向
        changeDir();
    }
    return 0;
}