#include <bits/stdc++.h>

using namespace std;

int n, ans;
string s;
map<string, int> mp;

int main()
{
    freopen("restante.in", "r", stdin);
    freopen("restante.out", "w", stdout);
    cin>>n;
    while(n--)
        cin>>s, sort(s.begin(), s.end()), ++mp[s];
    for(const auto &el : mp) ans += el.second == 1;
    cout<<ans;
    return 0;
}