#include <bits/stdc++.h>
using namespace std;
void Fast();
void solve();
int main()
{
Fast();
solve();
return 0;
}
void Fast()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
}
void solve()
{
string s, cp = "", hel = "hello";
cin >> s;
for (int i = 0; i < s.size(); i++)
{
if (s[i] == 'h' && s[i + 1] == 'e')
{
cp.push_back(s[i]);
cp.push_back(s[i + 1]);
}
if (s[i] == 'l' && s[i - 1] == 'e' && s[i + 1] == 'l')
{
cp.push_back(s[i]);
cp.push_back(s[i + 1]);
}
if (s[i] == 'o' && s[i - 1] == 'l'&& s[i - 2] == 'l')
{
cp.push_back(s[i]);
}
}
if (hel == cp)
cout << "YES\n";
else
cout << "NO\n";
}
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