#include <bits/stdc++.h>
#include <string>
#include <algorithm>
#include <vector>

using namespace std;

int main()
{
    freopen ("input.txt", "r", stdin);
    freopen ("output.txt", "w", stdout);
    system("color 0B");
    setlocale(LC_ALL, "rus");
    int n;
    cin >> n;
    string g;
    vector <string> v;
    for (int i = 0; i < n; i++)
    {
        cin >> g;
        v.push_back(g);
    }
    sort(v.begin(), v.end());
    int j = 1;
    for (int i = n; i > 1; i--)
    {
        j *= i;
    }
    cout << j << endl;
    do
    {
        for (int i = 0; i < v.size(); i++)
            cout << v[i] << " ";
        cout << endl;
    }
    while(next_permutation(v.begin(), v.end()));
}