#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 s[1500],h[6]="hello"; cin>>s; int x=0; for(int j=0;s[j]!='\0';j++){ if(s[j]==h[x]){ x++; } }if(x>=5){ cout<<"YES"; }else{ cout<<"NO"; } return 0; }