import java.util.*;

public class Main{
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        ArrayList<String> listA = new ArrayList<String>();
        
        for(int i=0; i<n; i++) {
            listA.add(sc.next());
        }
        List<String> listB = new ArrayList<String>(new LinkedHashSet<>(listA));

        System.out.println(listB.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