import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
        // Your code here!

       Scanner sc = new Scanner(System.in);
       int i = sc.nextInt();
       List<String> tinko = new ArrayList<>();

       for(int t = 0;t < i;t++){
           tinko.add(sc.next());
       }

       Long kosuu = tinko.stream().distinct().count();

       System.out.println(kosuu);

    }

}
/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