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>
int main(void){
  int i,n;
  char a[10];
  scanf("%s",a);
  for(i=0;a[i]!='\0';i++){
    n++;
  }
  for(i=0;a[2*i]!='\0'||a[2*i+1]!='\0';i++){
    if(!(a[2*i]=='h'&&a[2*i+1]=='i')){
      printf("No");
      return 0;
    }
  }
    printf("Yes");
    return 0;
  }