#include<bits/stdc++.h> using namespace std; int sum,sum1,sum2,sum3; int main(){ char a[1500]; scanf("%s",a); int len=strlen(a); int t[1500]={0}; for(int i=0;i<len;i++){ if(a[i]=='h'){ sum++; }else if(a[i]=='e'&&sum>=1){ sum1++; }else if(a[i]=='l'&&sum1>=1){ sum2++; }else if(a[i]=='l'&&sum2>=1){ sum2++; }else if(a[i]=='o'&&sum2>=2){ sum3++; } } if(sum>=1&&sum1>=1&&sum2>=2&&sum3>=1){ cout<<"YES"; }else{ cout<<"NO"; } return 0; }