import java.util.*;
class Main{
 static public void main(String args[]){
	Scanner sc=new Scanner(System.in);
	Set<String> set=new HashSet<String>();
	
	int num=sc.nextInt();
	for(int i=0;i<=num;i++){
		String str=sc.nextLine();
		set.add(str);
	}
	System.out.println(set.size()-1);
 }
}
/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