import java.util.LinkedHashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		String[] S = new String[N];
		Set<String> list = new LinkedHashSet<String>();
		for(int i = 0; i < N; i++) {
			 S[i] = sc.next();
		}
		sc.close();
		
		for(int i = 0; i < N; i++) {
			 list.add(S[i]);
		}
		
		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