#include <fstream>
#include <algorithm>
#include <map>
#include <string>
using namespace std;

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

vector<string> v[36010];
map<string, int> Map;
string s;

int main() {
    int n, answer = 0, nr = 0;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> s;
        sort(s.begin(), s.end());
        nr++;
        v[nr].push_back(s);
        Map[s]++;
    }
    for (int i = 1; i <= nr; i++)
        if (Map[v[i][0]] == 1)
            answer++;
    cout << answer;
    return 0;
}