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import java.util.Scanner;
//saiyam9934
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
sc.close();
// Initialize variables
int index = 0;
String hello = "hello";
// Iterate through each character in the string
for (int i = 0; i < s.length(); i++) {
// Check if the current character matches the next character in "hello"
if (s.charAt(i) == hello.charAt(index)) {
index++; // Move to the next character in "hello"
}
// Check if all characters in "hello" have been matched
if (index == hello.length()) {
System.out.println("YES");
return;
}
}
// If we reach here, it means Vasya didn't manage to say hello
System.out.println("NO");
}
}