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