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

using namespace std;

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

int n, ans;
map<string, int> cnt;

int main() {
	in >> n;
	while (n--) {
		string s;
		in >> s;
		sort(s.begin(), s.end());
		cnt[s]++;
	}
	for (const auto& x : cnt)
		ans += x.second == 1;
	out << ans;
}