#include<iostream> #include<cstring> using namespace std; int main(){ char a[1000],b[5]={'h','e','l','l','o'}; int c=0,i; cin>>a; for(i=0;i<strlen(a);i++){ if(a[i]==b[c]){ c++; } } if(c==5){ cout<<"YES"; }else{ cout<<"NO"; } return 0; }