#include <algorithm>
#include <fstream>
#include <map>
using namespace std;
ifstream in("restante.in");
ofstream out("restante.out");
map <string, int> ap;
int main()
{
    int n;
    in >> n;
    for (int i = 1; i <= n; i++)
    {
        string s = "";
        in >> s;
        sort(s.begin(), s.end());
        ap[s]++;
    }
    int nr = 0;
    for(auto it : ap)
        if(it.second == 1)
            nr++;
    out << nr << "\n";
    return 0;
}