#include <iostream>
#include <unordered_set>
using namespace std;
int main() {
	unordered_set<string> a;
	int n;
	cin >> n;
	string x;
	for(int i = 0; i < n; i++){
		cin >> x;
		a.emplace(x);
	}
	cout << a.size() << endl;
}