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# (Mono 4.6.2.0) (judge verdict: Wrong Answer)

class HitachiSocialSystem2020A
{
  static void Main()
  {
    var in_S=System.Console.ReadLine();
    var returnFlag=true;
    for(
      var number=0;
      number<in_S.Length;
      number+=2
    )
    {
      returnFlag&=(in_S[number]=='h'&&in_S[number]=='i');
    }
    System.Console.WriteLine(
      returnFlag?
      "Yes":"No"
    );
  }
}