#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep1(i, n) for (int i = 1; i <= (int)(n); i++)
typedef int64_t Int;

int main(){
    int N; cin >> N;

    set<string> S;
    rep(i,N){
        string s; cin >> s;
        S.insert(s);
    }

    cout << S.size() << endl;
}