#include<bits/stdc++.h>

using namespace std;

vector<pair<int, int>> v{{0, 0}, {1, 1}, {1, 2}, {1, 3}, {2, 1}, {2, 2}, {2, 3}, {3, 1}, {3, 2}, {3, 3}};

bool operator!=(pair<int, int> a, pair<int, int> b)
{
    return (a.first != b.first && a.second != b.second);
}

bool f(pair<int, int> a, pair<int, int> b, pair<int, int> c)
{
    set<int> s1, s2;
    s1.insert(a.first);
    s1.insert(b.first);
    s1.insert(c.first);
    s2.insert(a.second);
    s2.insert(b.second);
    s2.insert(c.second);
    return ((s1.size() == 3 && s2.size() == 1) || (s2.size() == 3 && s1.size() == 1) || (s2.size() == 3 && s1.size() == 3));
}

check(vector<vector<set<int>>> &m)
{
    for(int i = 1; i <= 9; i++)
    {
//      cout << i << " ";
        if(m[v[i].first][v[i].second].size() == 0)
            continue;
        for(int j = 1; j <= 9; j++)
        {
            if(m[v[j].first][v[j].second].size() == 0)
                continue;
            for(int k = 1; k <= 9; k++)
            {
                if(m[v[k].first][v[k].second].size() == 0)
                    continue;
                if(f(v[i], v[j], v[k]))
                {
//                  cout << "123";
                    int i1 = *m[v[i].first][v[i].second].begin();
                    int i2 = *m[v[j].first][v[j].second].begin();
                    int i3 = *m[v[k].first][v[k].second].begin();
                    cout << i1 << " " << i2 << " " << i3 << "\n";
                    m[v[i].first][v[i].second].erase(*m[v[i].first][v[i].second].begin());
                    m[v[j].first][v[j].second].erase(*m[v[j].first][v[j].second].begin());
                    m[v[k].first][v[k].second].erase(*m[v[k].first][v[k].second].begin());
                }
            }
        }
    }
    for(int i = 1; i <= 9; i++)
    {
        if(m[v[i].first][v[i].second].size() == 3)
        {
            int i1 = *m[v[i].first][v[i].second].begin();
            m[v[i].first][v[i].second].erase(*m[v[i].first][v[i].second].begin());
            int i2 = *m[v[i].first][v[i].second].begin();
            m[v[i].first][v[i].second].erase(*m[v[i].first][v[i].second].begin());
            int i3 = *m[v[i].first][v[i].second].begin();
            m[v[i].first][v[i].second].erase(*m[v[i].first][v[i].second].begin());
//          cout << "ffff";
            cout << i1 << " " << i2 << " " << i3 << "\n";
        }
    }
}

main()
{
    vector<vector<set<int>>> m(4, vector<set<int>>(4, set<int>()));
    int n;
    cin >> n;
    for(int i = 0; i < n; i++)
    {
        int f, t;
        cin >> f >> t;
        m[f][t].insert(i + 1);
        check(m);
    }
}