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 <stdbool.h>

#define BUFSIZE (10)

int main()
{
	char s[BUFSIZE] = {0};
	scanf("%s", &s);

	int ans = true;
	int size = strlen(s);

	if((size % 2) != 0) {
		ans = false;
		goto EXIT;
	}

	int i;
	for (i=0; i<size; i+=2) {
		if ((s[i] != 'h') || (s[i+1] != 'i')) {
			ans = false;
			break;
		}
	}

EXIT:
	if (ans) {
		printf("Yes");
	} else {
		printf("No");
	}

	return 0;
}