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

int main() {
    int n;
    cin >> n;
    string s;
    unordered_set<string> hash;

    while (n--) {
        cin >> s;
        hash.insert(s);
    }

    cout << hash.size() << endl;

    return 0;
}