#include <string>
#include <fstream>
#include <algorithm>
#include <map>
using namespace std;
int N,NR;
map<string,int> Cnt;
ifstream f("restante.in");
ofstream g("restante.out");
string S;
int main()
{
    f>>N;
    getline(f,S);
    for (int i=1;i<=N;++i)
    {
        getline(f,S);
        sort(S.begin(),S.end());
        Cnt[S]++;
    }
    map<string,int>::iterator it;
    for (it=Cnt.begin();it!=Cnt.end();++it)
      if (it->second == 1) ++NR;
    g<<NR;
    return 0;
}