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<string.h>
int main(void){
  int i=0;
  char hi[10];
  scanf("%s",hi);
  while(hi[i]){
    if(hi[i]!='h' && hi[i]!='i'){
      printf("No");
      return 0;
    }
    i++;
  }
  
  for(int k=0;k<9;k++){
    if(hi[k]=='h'){
      if(hi[k+1]!='i'){
	printf("No");
	return 0;
      }
    }
  }
  for(int m=0;m<9;m++){
    if(hi[m+1]=='i'){
      if(hi[m]!='h'){
	printf("No");
	return 0;
      }
    }
  }
  

  
  printf("Yes");
  return 0;
  
}