#include<bits/stdc++.h> using namespace std; int main(){ char a[1500]; char b[10] = {'h','e','l','l','o'}; cin>>a; int n=0; for (int i=0;i<strlen(a);i++) { if (a[i] == b[n]) { n++; } } if(n==5) { cout<<"YES"; } else { cout<<"NO"; } return 0; }