#include<iostream> #include<cstring> using namespace std; int main(){ char a[1501],b[6]={'h','e','l','l','o'}; int d=0; cin>>a; for(int j=0;a[j]!='\0';j++){ if(a[j]==b[d]){ d++; } } if(d==5){ cout<<"YES"; }else{ cout<<"NO"; } return 0; }