#include<iostream> #include<cstring> using namespace std; int main(){ int b[5]={'h','e','l','l','o'}; char a[2000]; int q=0; cin>>a; int k=strlen(a); int i=0; while(i<k){ if(a[i]==b[q]){ q++; } i++; } if(q==5){ cout<<"YES"<<endl; }else{ cout<<"NO"<<endl; } return 0; }