#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[10000],b[5]={"h","e","l","l","o"}; cin>>a; int l=0; for(int i=0;a[i]!='\0';i++) { if(a==b){ l++; } } if(l==5){ cout<<"YES"<<endl; }else{ cout<<"NO"<<endl; } return 0; }