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){
  char s[10];
  int i = 0;
  int hnum = 0;
  int inum = 0;
  scanf("%s", s);
  if (strlen(s) < 2){
    printf("No");
    return 0;
  }
  for(i=0;i<strlen(s);i++){
    if(i%2==0){
      if(s[i]!='h'){
        printf("No");
        return 0;
      }
    }
    if(i%2!=0){
      if(s[i]!='i'){
        printf("No");
        return 0;
      }
    }
  }
  printf("Yes");
}