import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner scan = new Scanner(System.in);
    Set<String> set = new HashSet<String>();
    int n = scan.nextInt();
    String[] s = new String[n];
    for(int i = 0; i < n; i++){
      s[i] = scan.next();
      set.add(s[i]);
    }
    System.out.println(set.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