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 <stdio.h>
#include <string.h>

int main(void)
{
  char a[10];
  scanf("%s", a);
  int lenght = strlen(a);
  int counter = 0;
  for (int i = 0; i < lenght; i += 2)
  {
    if (a[i] == 'h' && a[i + 1] == 'i')
    {
    }
    else
    {
      counter++;
    }
  }
  if (counter == 0)
  {
    printf("Yes");
    return 0;
  }
  else
  {
    printf("No");
    return 0;
  }
}