import java.io.*;
import java.util.*;
import java.util.Collection;
class Main
{
  public static void main(String args[])  throws java.lang.Exception
  {
    BufferedReader br= new BufferedReader (new InputStreamReader(System.in));
    int n=Integer.parseInt(br.readLine());
    HashSet<String> hs=new HashSet<String>();
    for(int i=0;i<n;i++)
     {
       String s=br.readLine();
       hs.add(s);
     } 
    System.out.println(hs.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