#include<bits/stdc++.h> using namespace std; int main(){ char a[1550]; gets(a); char b[6]="hello"; int len=strlen(a); int count=0; for(int i=0;i<len;i++){ if(a[i]==b[count]){ count++; } } if(count==5) cout<<"YES"; else cout<<"NO"; return 0; }