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

int main ()
{
    std::ifstream fin("restante.in");
    std::ofstream fout("restante.out");

    std::map<std::string,int> count;
    int n;
    fin>>n;
    std::string s;

    for(int i=0;i<n;i++)
    {
        fin>>s; 
        std::sort(s.begin(), s.end());
        count[s]++;
    }
    int total = 0;
    for (auto& e: count)
    {
        if(e.second == 1)
        {
            total+=1;
        }
    }
    fout<<total;


    return 0;
}