#include <bits/stdc++.h>


using namespace std;

int main()
{
    int h=0,e=0,l=0,l1=0,o=0;
    string s;
    cin >> s;
    for (h = 0; h <= s.length()-1 ; h++)
    {
        if (s[h]=='h')
            break;
    }
    for (e=h ; e<=s.length()-1; e++)
    {
        if (s[e]=='e')
            break;
    }
    for (l=e; l<=s.length()-1 ; l++)
    {
        if (s[l]=='l')
            break;
    }
    for (l1=l+1;l<=s.length()-1 ;l1++)
    {
        if (s[l1]=='l')
            break;
    }
    for (o=l1;o<=s.length()-1;o++)
    {
        if(s[o]=='o')
            break;
    }
    if (h<e && e<l && l<l1 && l1<o)
        cout << "YES";
    else
        cout << "NO";
    return 0;
}