import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[]args) {
        try {
        
         BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(br.readLine());

      HashSet<String> lottery = new HashSet<String>();
      for(int i = 0;i<n;i++) {
          String words = br.readLine();
          lottery.add(words);
      }
System.out.println(lottery.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