#define IOS ios_base::sync_with_stdio(false),cin.tie(nullptr);
typedef unsigned long long ull;
typedef long long ll;
#include<bits/stdc++.h>
using namespace std;
const int N = 2e5 + 10;
ll INF = LLONG_MAX;
int mod = 1e9 + 7;
int n , m , sum = 0;
unordered_map<string , int> mp;
void solve(){
    cin >> n;
    while(n--){
        string str ; cin >> str;
        mp[str]++;
    }
    cout << mp.size() << endl;
}
signed main(){
    int T = 1;
    IOS;
    //cin >> T;           
    while(T --){
        solve();
    }
    return 0;
}