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

int main() {
    int n;
    cin >> n;
    map<string, int> mp;
    for (int i = 0; i < n; i++) {
        string s;
        cin >> s;
        mp[s]++;
    }
    cout << mp.size() << endl;
    return 0;
}