as

#include<bits/stdc++.h>
using namespace std;
int main()
{
char a[1500];
char b[100] = {'h','e','l','l','o'};
cin>>a;
int count = 0;
for(int i=0;i<strlen(a);i++)
{
if(a[i] == b[count])
{
count++;
}
}
if(count == 5)
{
cout<<"YES";
}
else
{
cout<<"NO";
}
return 0;
}