ewe

import java.util.Scanner;
//import java.lang.String;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str=new String(sc.next());
        char[] chars=str.toCharArray();
        String temp="";
        for (int i = 0; i <str.length() ; i++) {
            if(temp.contains(chars[i]+"")==false){
                temp+=chars[i];
        }
    }

        if(temp.contains("helo")==true){
            System.out.println("YES");
        }
        else{
            System.out.println("NO");
        }
}}