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 3.8.0) (judge verdict: Runtime Error)

#include <stdio.h>

void main() {
	char a[10];
	scanf("%s", a);
	for(size_t b=0; b<5; b++) {
		if(a[b*2] == 0) {
			break;
		} else if(a[b*2] != 'h' || a[b*2+1] != 'i') {
			printf("No");
			return;
		}
	}
	printf("Yes");
}