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