Codeforces_58A

//Codeforces 58A
#include <string>
#include <cstring>
#include <iostream>
using namespace std;
int main()
{
    int len, z=0, answ=0;
    string s;
    char mass[101];
    cin >> s;
    len = s.size();
    strcpy(mass, s.c_str());
    for(int i=z;i<len;i++)
    {
        if(mass[i]=='h'){answ++;z=i+1;break;}
    }
    for(int i=z;i<len;i++)
    {
        if(mass[i]=='e'){answ++;z=i+1;break;}
    }
    for(int i=z;i<len;i++)
    {
        if(mass[i]=='l'){answ++;z=i+1;break;}
    }
    for(int i=z;i<len;i++)
    {
        if(mass[i]=='l'){answ++;z=i+1;break;}
    }
    for(int i=z;i<len;i++)
    {
        if(mass[i]=='o'){answ++;z=i+1;break;}
    }
    if(answ==5){cout<<"YES";}
    else{cout<<"NO";}
    return 0;
}