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/* In the name of Allah, Most Gracious, Most Merciful*/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define cint cin >> t
#define whl while (t--)
#define vi vector<int>
#define vll vector<ll>
#define Y "YES"
#define N "NO"
#define ascii(n) static_cast<int>(n);
const int MOD = 1e9 + 7; // Example modulus for large numbers
const int INF = INT_MAX; // Infinity representation
#define for0(n) for (int i = 0; i < (n); i++)
#define for1(n) for (int i = 1; i < (n); i++)
#define fore1(n) for (int i = 1; i <= (n); i++)
#define optimize()                \
    ios_base::sync_with_stdio(0); \
    cin.tie(0);                   \
    cout.tie(0)
bool cmp(const pair<int, int> &p1, const pair<int, int> &p2)
{
    if (p1.first > p2.first)
        return 1;
    else if (p1.first == p2.first)
        return (p1.second < p2.second);
    else
        return 0;
    // Or *(-1) with p.first
}
// for (auto &u : s)
// {
//     u = tolower(static_cast<unsigned char>(u));
// }

void Ahlan_Wa_Sahlan()
{
    optimize();
    string s;
    cin >> s;
    int sz = s.size(), flag = 0, count = 0;
    for0(sz)
    {
        if (s[i] == 'h' && flag==0)
            flag = 1;
        else if (s[i] == 'e' && flag == 1)
            flag = 2;
        else if (s[i] == 'l' && flag >= 2)
        {
            if (count == 0)
            {
                flag = 3;
                count = 1;
            }
            else
            {
                flag = 4;
            }
        }
        else if (s[i] == 'o' && flag == 4)
            flag = 5;
    }
    if (flag == 5)
        cout << Y << endl;
    else
        cout << N << endl;
}
int main()
{
    Ahlan_Wa_Sahlan();
}