#include <bits/stdc++.h>
using namespace std;
const int N = 1e8;
char a[N];
int main() {
	int sum1 = 0, sum2 = 0, sum3 = 0, sum4 = 0;
	scanf("%s", a);
	for (int i = 0; i <= strlen(a); i++) {
		if(a[i] == 'h')
			sum1++;
		if(a[i] == 'e')
			sum2++;
		if(a[i] == 'l')
			sum3++;
		if(a[i] == 'o')
			sum4++;
	}
	if(sum1 >= 1 && sum2 >= 1 && sum3 >= 2 && sum4 >= 1)
		printf("YES\n");
	else
		printf("NO\n");
	return 0;
}