import java.util.*;
class Main{
	public static void main(String args[]){
    	Scanner sc=new Scanner(System.in);
      	int n=sc.nextInt();
      	HashMap<String,Integer> hm=new HashMap<>();
      	while(n--!=0){
        String str=sc.next();
          if(hm.containsKey(str)){
          	
          }else{
          	hm.put(str,1);
          }
        }
      System.out.println(hm.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