import java.util.HashSet;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		long n = sc.nextLong();

		HashSet<String> hs = new HashSet<String>();
		String s = null;

		sc.nextLine();

		for (int i = 0; i < n; i++) {

			s = sc.nextLine();
			hs.add(s);
		}

		System.out.println(hs.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