#include <stdio.h>
#include <iostream>
#include <vector>
#include <set>
#include <string>

using namespace std;

int main(){
    freopen("input.txt","r",stdin); freopen("output.txt","w",stdout);
    int n;
    while(cin>>n){
        vector<string> arr(n);
        set<string> difs;
        for(int i=0;i<n;i++){
            string s,to_set;
            to_set=".........";
            cin >> s;
            for(int j=0;j<s.length();j++)
                to_set[s[j]-'1'] = '+';
            difs.insert(to_set);
        }
        cout << difs.size() << endl;
    }
    return 0;
}