import java.io.*;
import java.util.*;
public class Main
{
  public static void main(String args[])throws IOException
  {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer(br.readLine());
    int n = Integer.parseInt(st.nextToken());
   String arr[] = new String[n];
   for(int i=0;i<n;i++)
   {
   		
   		arr[i]=br.readLine();
   }
   Arrays.sort(arr);
   int c=0;
   HashMap <String, Integer> map= new HashMap<>();
   for(int i=0;i<n;i++)
   {
   		if(!map.containsKey(arr[i])){
   			c++;
   			map.put(arr[i],1); 
   		}
   }
   System.out.println(c);
}
}
/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