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

using namespace std;

ifstream in ("restante.in");
ofstream out ("restante.out");

string S[36010];

int main()
{
    int N, i, j, Ans = 0, now = 1;

    in >> N;
    for (i = 1; i <= N; i ++){
        in >> S[i];
        sort (S[i].begin (), S[i].end ());
    }

    sort (S + 1, S + N + 1);

    for (i = 1; i <= N; i ++){
        if (S[i] == S[i + 1])
            now ++;
        else{
            if (now == 1)
                Ans ++;

            now = 1;
        }
    }

    out << Ans;

    return 0;
}