import java.util.*;
class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      int T =sc.nextInt();
      HashMap<String, Integer> map = new HashMap<>();
      for(int i =0; i<T;i++){
      	String a =sc.next();
        if( map.containsKey(a))
          	continue;
        else
          map.put(a,0);
      }
      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