
import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int n = sc.nextInt();
		List<String> listS = new ArrayList<String>();
		for (int i = 0; i < n; i++) {
			String s = sc.next();
			listS.add(s);
			s = null;
		}
		List<String> listSsec = new ArrayList<String>(new LinkedHashSet<>(listS));
		System.out.println(listSsec.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