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 s[10];

    scanf("%s", &s);

    int i =0;

while(s[2*i]!=NULL){
   if(s[2*i] != 'h'){
       printf("No");
  //   printf("%c", s[0]);
       return 0;
   }else{
       if(s[2*i + 1] != 'i' || s[2*i+1] == NULL){
           printf("No");
           return 0;
       }
   }
  i++;
}

printf("Yes");
return 0;
}