#include <fstream>
#include <algorithm>
#include <map>
using namespace std;
ifstream in("restante.in");
ofstream out("restante.out");
map <string, int> m;
int main()
{
    int n;
    in >>n;
    while( n-- )
    {
        string s;
        in >>s;
        sort(s.begin(),s.end());
        m[s]++;
    }
    int nr = 0;
    for(auto i: m)
        if(i.second == 1)
            nr++;
    out<<nr;
    return 0;
}