#include <bits/stdc++.h>
using namespace std;
ifstream f("restante.in");
ofstream g("restante.out");
string cuv[36003];
map <string, int> Mp;
int main()
{
    int n, ans = 0;
    f >> n;
    for(int i = 1; i <= n; i++) {
        f>> cuv[i];
        sort(cuv[i].begin(),cuv[i].end());
    }
    for(int i = 1; i <= n; i++)
        Mp[cuv[i]]++;
    for(int i = 1; i <= n; i++)
        if(Mp[cuv[i]] == 1)
            ans++;
    g << ans;
    return 0;
}