#include <bits/stdc++.h>

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