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

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());

		String aaa = sc.next();
		Map<String, String> prizeMap = new HashMap<>();
		prizeMap.put(aaa,aaa);

		for(int i = 1;i < N; i++) {
			String prize = sc.next();
			if(prizeMap.containsKey(prize)) {
				//取れちゃった
			}else {
				prizeMap.put(prize, prize);
			}
		}
		sc.close();
		System.out.println(prizeMap.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