#include "bits/stdc++.h"
using namespace std;
 
////////////// Prewritten code follows. Look down for solution. ////////////////

#define fs first
#define sc second
#define pb push_back
#define len(x) ((int)(x).size())
#define fastio ios::sync_with_stdio(false), cin.tie(0), cout.tie(0);

typedef pair<int, int> pii;
typedef vector<int> vi;
typedef long long ll;

const ll LINF = 1e18;
const int INF = 1e9;
const int MOD = 1e9+7;

/// command for char arrays with spaces -> scanf(" %[^\n]", text);
 
////////////////////////// Solution starts below. //////////////////////////////

int main(){
	fastio;
	int n;
	cin >> n;
	set<string> st;
	while(n--){
		string s;
		cin >> s;
		st.insert(s);
	}	
	cout << len(st) << endl;
	return 0;
}