import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
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
		
		List<String> array=new ArrayList<>();
		

		Scanner sc=new Scanner(System.in);
		int kuzi=sc.nextInt();
		
		for(int i=0;i<kuzi;i++) {
			array.add(sc.next());
			
		}
		
		List<String> result=new ArrayList<>(new HashSet<>(array));
		
		System.out.println(result.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