#include <iostream>
#include <set>
#include <string>
using namespace std;

int main() {
    int n;
    cin >> n;
    cin.ignore(); 
    set<string> a;
    string temp;
    for (int i = 0; i < n; ++i) {
        getline(cin, temp);
        a.insert(temp);
    }

    cout << a.size();
}