#include <bits/stdc++.h>
#define ll long long
using namespace std;

const string fisier = "restante";
ifstream fin (fisier + ".in");
ofstream fout (fisier + ".out");

int main(){
   ios_base::sync_with_stdio(false);
   fin.tie(0);
   fout.tie(0);

   int n; fin >> n;
   map<string, int>mp;
   for (int i = 0; i < n; i++){
    string s; fin >> s;
    sort(s.begin(), s.end());
    ++mp[s];
   }
   int answer = 0;
   for (auto x : mp){
    answer += (x.second == 1);
   }
   fout << answer;
}