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()
{
    int a=0;
    char s[11];
	int l;
  
    // 文字列の入力
    scanf("%s",s);

    // 文字サイズの入力
    l=strlen(s);


for(a = 0 ;l>a;a=a+2){
  if((s[a]=='h')&&(s[a+1]=='i')){

    // 出力
  }else{
    printf("No");
    return 0;
    
}
}
    printf("Yes");
    return 0;

}