#include <iostream>
#include <string>
#include <algorithm>
#include <map>
#include <fstream>

using namespace std;

string s;
map<string,int>m;

int main()
{
    ifstream cin("restante.in");
    ofstream cout("restante.out");
    int n;
    cin >> n;
    while(n--)
    {
        cin >> s;
        sort(s.begin(),s.end());
        m[s]++;
    }
    int cnt = 0;
    for(map<string,int>::iterator it = m.begin() ; it != m.end() ; it++)
        if(it->second == 1)
            cnt++;
    cout << cnt << "\n";
    return 0;
}