Problem:
Score : 100 points

Problem Statement

A Hitachi string is a concatenation of one or more copies of the string hi.

For example, hi and hihi are Hitachi strings, while ha and hii are not.

Given a string S, determine whether S is a Hitachi string.

Constraints

The length of S is between 1 and 10 (inclusive).

S is a string consisting of lowercase English letters.

Input

Input is given from Standard Input in the following format:

S

Output

If S is a Hitachi string, print Yes; otherwise, print No.

Sample Input 1

hihi

Sample Output 1

Yes

hihi is the concatenation of two copies of hi, so it is a Hitachi string.

Sample Input 2

hi

Sample Output 2

Yes

Sample Input 3

ha

Sample Output 3

No

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include<bits/stdc++.h>
using namespace std;
#define For(i,m,n) for(int i=m;i<n;i++)
#define FOR(n) for(int i=0;i<n;i++)
#define ll long long
ll mob=1000000007;
using namespace std;
int main()
{ string k;
 cin>>k;
 for(int i=0;i<(int)k.length();i++)
 {if(i%2==0)
 {if(k[i]=='h')
   continue;
  else
  {
  cout<<"No";
  goto end;
  }
 }
  if(i%2!=0)
 {if(k[i]=='i')
   continue;
  else
  {
  cout<<"No";
  goto end;
  }
 }
  
 }


cout<<"Yes";
 end:;


return 0;
}