#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[1501]={}; char s[5]={'h','e','l','l','o'}; int n=0; cin>>a; for(int i=0;a[i]!='\0';++i){ if(a[i]==s[n]) n++; } if(n==5) cout<<"YES"<<endl; else cout<<"NO"<<endl; return 0; }