#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],s1[5]={'h','e','l','l','e'}; int c=1; cin>>s; for(int i=0;s[i]!='\0';++i){ if(s[i]==s1[c]){ c++; } } if(c==5){ cout<<"YES"; } else{ cout<<"NO"; } return 0; }