# include<iostream> using namespace std; int main(){ char f[6]="hello", a[1501], n=0, l=0; cin>>a; while(a[l]!='\0')l++; for(int i = 0; i < l; i++)if(a[i]==f[n])n++; if(n==5){ cout<<"YES"; }else{ cout<<"NO"; } return 0; }