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