import java.util.Scanner;
import java.util.HashSet;
public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    HashSet<String> set = new HashSet<>();
    int t = scan.nextInt();
    int ans = 0;
    for(int i = 0; i < t; i++){
        String s = scan.next();
        if(!set.contains(s)){
            set.add(s);
            ans++;
        }
    }
    System.out.println(ans);
  }
}
/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