#include <bits/stdc++.h>
using namespace std;
#define FILEIO 0
#define ll long long
#define endl "\n"
#define IN cin
#define OUT cout
#define FOR(var, start, end) for (int var = start; var < end; var++)
#define MAXSIZE (int)(2*10e5)
#define dbg(v) cout << "Line(" << __LINE__ << ") -> " << #v << " = " << (v) << endl;
 
int main(){
    ll n; cin >> n; 
    vector<string> a(n);
    for (ll i = 0; i < n; i++) cin >> a[i];

    map<string, ll> m;

    for (int i = 0; i < n-1 ; i++){
        for (int j = i+1; j <n ; j++){
            if (a[i].size() != a[j].size()) continue;
            for (int x = 0 ; x < a[i].size()-1 ; x++){
                string s1a = a[i].substr(0,x);
                string s1b = a[j].substr(0,x);
                string s2a = a[i].substr(x,2);
                string s2b = a[j].substr(x,2);
                string s3a = a[i].substr(x+2, a[i].size()-x-2);
                string s3b = a[j].substr(x+2, a[i].size()-x-2);
                if (s1a.compare(s1b) ==0  && s2a.compare(s2b) != 0 && s3a.compare(s3b) == 0){
                    if (s2a.compare(s2b) > 0) m[s2a+s2b]++; 
                    else m[s2b+s2a]++;
                    break;
                }
            }
        }
    }
    ll count = 0;
    for (auto i : m){
        if (i.second == 1){
            count++;
        }
    }
    cout << count;
return 0;
}