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

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