import java.util.Map.Entry;
import java.util.*;

import org.w3c.dom.css.Counter;

public class Main {
//public class App {

    public static void main(final String[] args){
     //スキャン
     final Scanner s = new Scanner(System.in);
     HashSet<String> map = new HashSet<String>();
     final int ugeuge= Integer.parseInt(s.next());
      String tareget ="";

    for(int i=0;i < ugeuge ; i++){
        //Scanner hoge = new Scanner(System.in);
        //final String tareget = s.next();
        tareget= s.next();

        if(!map.contains(tareget)){
            map.add(tareget);
        }
    }
            System.out.println(map.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