#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; int x; cin>>a; for(int i;a[i]!='\0',i++){ if(x==0){ if(a[i]=='h') x++ } if(x==1){ if(a[i]=='e') x++; } if(x==2){ if(a[i]=='l') x++; } if(x==3){ if(a[i]=='l') x++; } if(x==4){ if(a[i]=='l') x++; } if(x==5) cout<<"YES"; else cout<<"NO"; }