#include <bits/stdc++.h>
using namespace std;
ifstream fin ("restante.in");
ofstream fout ("restante.out");
map<map<char ,int>, int>mp;
int n;
string s;
signed main() {
    fin >> n;
    for (int i = 1; i <= n; i++){
        fin >> s;
        map<char, int>fr;
        fr.clear();
        for (auto it:s)
            fr[it]++;
        mp[fr]++;
    }
    int cnt = 0;
    for (auto it:mp)
        cnt += (it.second == 1);
    fout << cnt;
    return 0;
}