#include <iostream>
#include <set>
#define endl '\n'

using namespace std;

int main() {
  set<string> s;

  int n = 0;
  cin >> n;

  string temp;

  for (int i = 0; i < n; i++) {
    cin >> temp;
    s.insert(temp);
  }

  cout << s.size();

  return 0;
}