#include<bits/stdc++.h> using namespace std; int main(){ char a[1500]; char b[100]={'h','e','l','l','o'}; cin>>a; int count=0; for(int i=0;i<strlen(a);i++){ if(a[i]==b[count]){ count++; } } if(count==5){ cout<<"YES"; }else{ cout<<"NO"; } return 0; }