import java.util.*;
import java.util.HashSet;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);

	    int N = sc.nextInt();
        HashSet list = new HashSet();
      
      for(int i=0 ;i < N; i++){
        String prize = sc.next();
        list.add(prize);
      }
      
      System.out.println(list.size());
      
    }
}

/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