#include<bits/stdc++.h>
using namespace std;map<string,int>M;int main(){ifstream f("restante.in");ofstream g("restante.out");int N,i,s=0;f>>N;string x;for(i=0;i<N;i++){f>>x;sort(x.begin(),x.end());if(!M[x])s++;else if(M[x]==1)s--;M[x]++;}g<<s;return 0;}