//
// Created by DELLPC on 24-4-21.
//
#include<bits/stdc++.h>
using namespace std;

int main() {
    int m;
    cin >> m;
    vector<int> n(m * m + 1, -1), s(m * m + 1, -1), w(m * m + 1, -1), e(m * m + 1, -1);
    int st;
    for(int i = 1; i <= m * m; i++) {
        cin >> n[i] >> s[i] >> w[i] >> e[i];
        if(n[i] == -1 && w[i] == -1) {
            st = i;
        }
    }
    for(int i = st; i != -1; i = s[i]) {
        for(int j = i; j != -1; j = e[j]) {
            cout << j << ' ';
        }
        cout <<endl;
    }
    return 0;
}