#include<bits/stdc++.h> using namespace std; int main() { string a; string b="hello"; cin>>a; int i=0; int c=a.size(); for(int j=0;j<c;j++){ if(a[j]==b[i]){ i++; } if(i==5){ break; } } if(i==5){ cout<<"YES"<<endl; } else{ cout<<"NO"<<endl; } return 0; }