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[]) {
		Scanner sc=new Scanner(System.in);
	int N=sc.nextInt();
	List<String> strList1=new ArrayList<String>();
	for(int i=0;i<N;i++) {
		String S=sc.next();
		strList1.add(S);
	}
	List<String> listB = new ArrayList<String>(new HashSet<>(strList1));
	int len=listB.size();
	System.out.println(len);
	}
}

/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