#include<bits/stdc++.h>

using namespace std;
#define ll  long long
#define ld  long double
#define endl '\n'
#define FAST ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
const ll MOD = 1e9 + 7;
const double PI = 3.141592653589793238463;
const int MAXN = 3e5 + 5;


void debug_out() {
    cerr << endl;
}

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << " " << H;
    debug_out(T...);
}

#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)

int main() {
    FAST
    int n;
    cin >> n;
    set<string> s;
    while (n--)
    {
        string h;
        cin>>h;
        s.insert(h);
    }
    cout<<s.size()<<endl;

        return 0;
}