#include <bits/stdc++.h>

using namespace std;

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

unordered_map <string, int> a;
int n;
string b;

bool inline compare(string x, string y)
{
    return x < y;
}

int main()
{
    
    fin >> n;
    for (int i = 0; i < n; i++)
    {
        fin >> b;
        sort(b.begin(), b.end());
        a[b]++;
    }
    int nr = 0;
    for (auto i : a)
    {
        if (i.second == 1)
            nr++;
    }
    fout << nr;
    return 0;
}