/******************************************************************************

                            Online Java Compiler.
                Code, Compile, Run and Debug java program online.
Write your code in this editor and press "Run" button to execute it.

*******************************************************************************/

import java.util.*;
public class Main
{
	public static void main(String args[]) throws Exception
	{
	    try
	    {
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		String str[]=new String[2*100000];
		for(int i=0;i<n;i++)
		{
		          str[i]=sc.next();
		}
		Set<String> set=new HashSet<>(Arrays.asList(str));
		set.remove(null);
		System.out.println(set.size());
	    }
	    catch(Exception e)
	    {}
	    


	}
}


/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