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

using namespace std;

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

map<string, int> mp;
string s;
int n, i, j, k, cnt;

int main()
{
    in >> n;

    for (i = 1; i <= n; i++)
    {
        in >> s;

        sort(s.begin(), s.end());

        mp[s]++;
    }

    for (pair<string, int> x : mp)
        if (x.second == 1)
        cnt++;

    out << cnt;

    return 0;
}