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(){
	char a[11];
	int len;
	scanf("%s",a);
	len=strlen(a);
	if(len==1||len%2!=0)
		printf("No");
	else{
	
		int i;
		int flat=0;
		for(i=0;i<len;i++){
			
			if(i==0||i%2==0)
				{
					if(a[i]!='h'){
					
						flat=1;
						break;	 }
				}
			else{
				if(a[i]!='i')
				{
					flat=1;
					break;
				}
			}
		}
		if(flat==0)
			printf("Yes");
		else
			printf("No");
	}
	
}