#include<iostream> #include<cstring> using namespace std; int main() { char a[1511]; int count=0; char b[5]={'h','e','l','l','o'}; cin>>a; for(int i=0;a[i]!='\0';++i) { if(a[i]==b[count]) count++; } if(count==5) cout<<"YES"<<endl; else cout<<"NO"<<endl; return 0; }