#include<bits/stdc++.h> using namespace std; int main() { char a[1511]; int count=0; char b[5]={'h','e','l','l','o'}; cin>>a; for(int i=0;a[i]!='\0';i++){ if(a[i]==b[count]){ count++; } } if(count==5){ cout<<"YES"<<endl; } else{ cout<<"NO"<<endl; } return 0; }