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