import java.io.*;
import java.lang.*;
import java.util.*;
public class Main{  
    public static void main(String[] args) throws IOException{
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        HashSet<String> hs=new HashSet<String>();
        int N=Integer.parseInt(br.readLine());
        int count=0;
        for(int i=0;i<N;i++){
            String str=br.readLine();
            boolean added=hs.add(str);
            if(added) 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