#include<bits/stdc++.h>
#define i64 long long
#define mx(a,b,c) max(a,max(b,c))
#define mn(a,b,c) min(a,min(b,c))
#define eef else if
#define ff(i,s,e) for(int i=(s); i<e; i++)
#define ff2(i,s,e) for(int i=(s); i>=e; i--)
#define sf scanf
#define pf printf
#define dbug(x) cout<<"x = "<<x<<endl
using namespace std;
int main()
{
int cse=0,cnt=0,flg=0;
string s,temp="";
while(getline(cin,s)){
int h=0,e=0,l=0,o=0;
if(s.size()<5)
cout<<"NO\n";
else{
ff(i,0,s.size()){
if(s[i]!='h'&&s[i]!='e'&&s[i]!='l'&&s[i]!='o'){
s[i]='\0';
}
}
ff(i,0,s.size()){
if(s[i]=='h'&&(temp=="")){
string str="h";
temp+=str;
}
else if(s[i]=='e'&&(temp=="h")){
string str="e";
temp+=str;
}
else if(s[i]=='l'&&(temp=="hel"||temp=="he")){
string str="l";
temp+=str;
}
else if(s[i]=='o'&&(temp=="hell")){
string str="o";
temp+=str;
}
}
if(temp=="hello")
cout<<"YES\n";
else
cout<<"NO\n";
}
temp="";
}
return 0;
}
#define i64 long long
#define mx(a,b,c) max(a,max(b,c))
#define mn(a,b,c) min(a,min(b,c))
#define eef else if
#define ff(i,s,e) for(int i=(s); i<e; i++)
#define ff2(i,s,e) for(int i=(s); i>=e; i--)
#define sf scanf
#define pf printf
#define dbug(x) cout<<"x = "<<x<<endl
using namespace std;
int main()
{
int cse=0,cnt=0,flg=0;
string s,temp="";
while(getline(cin,s)){
int h=0,e=0,l=0,o=0;
if(s.size()<5)
cout<<"NO\n";
else{
ff(i,0,s.size()){
if(s[i]!='h'&&s[i]!='e'&&s[i]!='l'&&s[i]!='o'){
s[i]='\0';
}
}
ff(i,0,s.size()){
if(s[i]=='h'&&(temp=="")){
string str="h";
temp+=str;
}
else if(s[i]=='e'&&(temp=="h")){
string str="e";
temp+=str;
}
else if(s[i]=='l'&&(temp=="hel"||temp=="he")){
string str="l";
temp+=str;
}
else if(s[i]=='o'&&(temp=="hell")){
string str="o";
temp+=str;
}
}
if(temp=="hello")
cout<<"YES\n";
else
cout<<"NO\n";
}
temp="";
}
return 0;
}
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