#include<bits/stdc++.h> using namespace std; char a[2000]; char b[5]={'h','e','l','l','o'}; int main(){ int box=0; cin>>a; for(int i=0;i<strlen(a);i++){ if(a[i]==b[box]) box++; } if(box==5) cout<<"YES"; else cout<<"NO"; return 0; }