#include<iostream> #include<cstring> using namespace std; int main(){ char a[11500]; cin>>a; int n=0,c=0; char b[]={'h','e','l','l','o'}; n = strlen(a); for(int i=0;i<n;i++){ if(a[i]==b[c]){ c++; } } if(c==5){ cout<<"YES"; } else{ cout<<"NO"; } return 0; }