#include <bits/stdc++.h>
using namespace std;

int readone(){
    int n, res = 0; cin >> n;
    while(n){
        res |= 1<<(n%10);
        n /= 10;
    }
    return res;
}

int main(){
    int n;
    while(scanf("%d", &n)){
        vector<int> v;
        for(int i = 0; i < n; i++){
            v.push_back(readone());
        }
        sort(v.begin(),v.end());
        int last = -1, res = 0;
        for( int x : v){
            if(x != last){
                res ++;
                last = x;
            } 
        }
        cout << res << endl;
    }
}