#include <iostream>
#include <fstream>
#include <map>
#include <algorithm>

using namespace std;

ifstream in("restante.in");
ofstream out("restante.out");

map <string, int> cuv;

int main()
{
    int n;
    string aux = "";

    in >> n;
    for (int i=1; i<=n; ++i){
        in >> aux;
        sort (aux.begin(), aux.end());
        cuv[aux]++;
    }

    long long ans = 0;
    for (auto item:cuv){
        if (item.second == 1)
            ans++;
    }

    out << ans;

    return 0;
}