import java.util.*;

public class Main {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();

		List<String> listA = new ArrayList<String>(); 
        
        for (int i=0; i<n; i++) {
			listA.add((scan.next()));
        }

        List<String> listB = new ArrayList<String>(new HashSet<>(listA));

//        System.out.println(listA);
//        System.out.println(listB);

        System.out.println(listB.size());
	    scan.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