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 (Clang 10.0.0) (judge verdict: Wrong Answer)

#include<stdio.h>
#include<string.h>

int main() {
	char s[11];
	scanf("%s", s);
	int flag = 0;
	for (int i = 0; i < strlen(s); i++) {
		if (i % 2 == 0) {
			if (s[i] != 'h') {
				printf("No");
				return 0;
			}
		}
		else if (s[i] != 'i') {
			printf("No");
			return 0;
		}
	}
	printf("Yes");

	return 0;
}