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: Wrong Answer)

#include<stdio.h>
#include <math.h>

int main()
{
  char S[10];
  int i=0,a;
  scanf("%s",&S);
  
  while(i<=10)
  {
    if(S[i]=='h' && S[i+1] == 'i')
    {
      a=1;
    }
    
    else if(S[i]=='h' || S[i]== 'i')
    {
      printf("No");
      return 0;
    }
    i++;
  }
  
  if(a==1)
  {
    printf("Yes");
    return 0;
  }
  
  printf("No");
  
  return 0; 
}