import java.util.HashMap;
import java.util.Scanner;

public class Main
{
	public static void main(String[] args)
	{
		HashMap<String, String> map = new HashMap<String, String>();
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		String str= sc.nextLine();
		for (int i=0; i<n; i++) {
			map.put(sc.nextLine(),"");
		}
		sc.close();

		System.out.println(map.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