#include<iostream> #include<algorithm> #include<cstring> #include<bits/stdc++.h> using namespace std; int main(){ char a[1501],b[6]={'h','e','l','l','o'}; int c=0; cin>>a; for(int i=0;a[i];i++){ if(a[i]==b[c]){ c++; } } cout<<(c==5?"YES":"NO"); return 0; }