//#include <iostream>
#include <fstream>
#include <algorithm>
#include <map>
std::map <std::string,int> m;
int main()
{
    std::ifstream cin("restante.in");
    std::ofstream cout("restante.out");
    int n;
    std::string s;
    cin>>n;
    cin.get();
    for(int i=1;i<=n;i++){
        cin>>s;
        long long x=s.length();
            sort(s.begin(),s.end());
        m[s]++;
    }
    long long cnt=0;
    for(auto it:m){
        if(it.second==1)
            cnt++;
    }
    cout<<cnt;
    return 0;
}