import java.util.*;
public class Main
{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
	 int t = sc.nextInt();
	 int count=0;
	  Set<String> set = new HashSet<String>();
	 while(t-->0){
	     String str= sc.next();
	    
	     set.add(str);
	 
}
 for(String stock : set){
   count++;
}
System.out.println(count);
	 
	}
}
/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