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

public class Main {
	public static void main(String[] args){
		Set<String> lottery = new LinkedHashSet<String>();
		Scanner scan = new Scanner(System.in);

		int N = Integer.parseInt(scan.nextLine());

		for(int i = 0; i < N; i++){
			String S = scan.nextLine();
			lottery.add(S);
		}

		System.out.println(lottery.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