a='heidi'
s=input()
j=0
for i in range(len(s)):
if s[i]==a[j]:
j+=1
if j==5:
break
if j==5:
print('YES')
else:
print('NO')#include <bits/stdc++.h>
using namespace std;
int main()
{
string s;
cin >> s;
unordered_map<char,vector<int>>mp;
for(int i = 0;i < s.length(); i++)
{
if(s[i] == 'h' || s[i] == 'e' || s[i] == 'i' || s[i] == 'd')
{
mp[s[i]].push_back(i);
}
}
bool isvalid = true;
if(mp.find('h') == mp.end() || mp.find('e') == mp.end() || mp.find('i') == mp.end() || mp.find('d') == mp.end())
{
cout<<"NO"<<endl;
return 0;
}
int ind = mp['h'][0];
if(lower_bound(mp['e'].begin(),mp['e'].end(),ind) == mp['e'].end())
{
cout<<"NO"<<endl;
return 0;
}else
{
ind = *lower_bound(mp['e'].begin(),mp['e'].end(),ind);
}
if(lower_bound(mp['i'].begin(),mp['i'].end(),ind) == mp['i'].end())
{
cout<<"NO"<<endl;
return 0;
}else
{
ind = *lower_bound(mp['i'].begin(),mp['i'].end(),ind);
}
if(lower_bound(mp['d'].begin(),mp['d'].end(),ind) == mp['d'].end())
{
cout<<"NO"<<endl;
return 0;
}else
{
ind = *lower_bound(mp['d'].begin(),mp['d'].end(),ind);
}
if(lower_bound(mp['i'].begin(),mp['i'].end(),ind) == mp['i'].end())
{
cout<<"NO"<<endl;
return 0;
}else
{
ind = *lower_bound(mp['i'].begin(),mp['i'].end(),ind);
}
cout<<"YES"<<endl;
return 0;
}1006A - Adjacent Replacements | 1195C - Basketball Exercise |
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822A - I'm bored with life | 9A - Die Roll |
1430B - Barrels | 279B - Books |
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1546B - AquaMoon and Stolen String | 1353C - Board Moves |
902A - Visiting a Friend | 299B - Ksusha the Squirrel |
1647D - Madoka and the Best School in Russia | 1208A - XORinacci |
1539B - Love Song | 22B - Bargaining Table |
1490B - Balanced Remainders | 264A - Escape from Stones |
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1359A - Berland Poker | 459A - Pashmak and Garden |
1327B - Princesses and Princes | 1450F - The Struggling Contestant |