import java.util.*;
class Main {
  public static void main(String args[]) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    HashMap<String, Integer> hashmap = new HashMap<String, Integer>();
    for(int i = 0; i < n; i++){
      String check = sc.next();
      if(!hashmap.containsKey(check)){
        hashmap.put(check, 0);
      }
    }
    System.out.println(hashmap.size());
    sc.close();
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz