#include <map>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream cin("restante.in");
ofstream cout("restante.out");
int n;
string strings;
map<string, int> sset;
int original = 0;
int main(){
    cin>>n;
    for(int x = 0;x<n;x++){
        cin>>strings;
        sort(strings.begin(), strings.end());
        sset[strings]++;
    }
    for(auto x : sset){
        if(x.second == 1)
            original++;
    }
    cout<<original<<'\n';
    return 0;
}