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

public class Main {

	public static void main(String[] args) {

		Scanner scanner = new Scanner(System.in);

		int times = Integer.parseInt(scanner.nextLine());
		HashMap<String, Integer> map = new HashMap<String, Integer>();
		for(int i = 0; i < times; i++) {
			map.put(scanner.nextLine(),1);
		}

		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