#include<bits/stdc++.h>
using namespace std;
int main()
{
string s;
cin>>s;
string ss="hello";
int i,k=0;
for(i=0;i<s.size();i++)
{
if(ss[k]==s[i])
k++;
}
if(k==ss.size())
cout<<"YES";
else
cout<<"NO";
return 0;
}
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