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++ (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;

int main()
{
  string a;
  cin>>a;
  int len=a.size();
  bool f=0;
  for(register int i=0;i<len;i++)
  {
  	if(a[i]=='h'&&a[i+1]=='i')
	  f=1,i++;
  	else
    {
      f=0;
      break;
    }
  }
  if(f)
  	cout<<"Yes\n";
  else
  	cout<<"No\n";
  return 0;
}