#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char a[11500]; int b=0,c=0,d=0,e=0; cin>>a; int i=0; while(a[i]!='\0'){ if(a[i]=='h'){ b++; continue; } if(a[i]=='e'){ c++; continue; } if(a[i]=='l'){ d++; continue; } if(a[i]=='o'){ e++; continue; } i++; } if(b>=1&&c>=1&&d>=2&&e>=1){ cout<<"YES"<<endl; } else{ cout<<"NO"<<endl; } return 0; }