#include<iostream>
#include<map>
#include<set>
#include<vector>
#include<algorithm>
 
using namespace std;
 
int main()
{
    int n, r, i;
    cin >> n;
    map <int, int> count;
    for (i = 0; i < n; ++i)
    {
        cin >> r;
        count[r]++;
    }
    set <pair<int, int> > S;
    for (auto elem: count)
        S.insert(make_pair(elem.second, elem.first));
    vector <int> Answer;
    int C[3];
    int R[3];
    while (S.size() >= 3)
    {
        for (i = 0; i < 3; ++i)
        {
            auto it = S.end();
            --it;
            C[i] = it->first;
            R[i] = it->second;
            S.erase(it);
            Answer.push_back(R[i]);
        }
        for (i = 0; i < 3; ++i)
        {
            if (C[i] != 1)
                S.insert(make_pair(C[i] - 1, R[i]));
        }
    }
    cout << Answer.size() / 3 << endl;
    for (i = 0; i < Answer.size(); i += 3)
    {
        cout << Answer[i] << " " << Answer[i + 1] << " " << Answer[i + 2] << endl;
    }
    return 0;
}

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