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: Wrong Answer)

#include <stdio.h>
#include <string.h>
 
int main(void) {
	const char hitachi[3] = { "hi" };
	char input[11];
	int ii;
	int not_hitachi = 1;
 
	memset(input, 0x00, sizeof(input));
 
	scanf("%s", input);
	for (ii = 0; input[ii] != 0 && ii<10;) {
		if (!(memcmp(&input[ii], hitachi, sizeof(char)*2))) {
			not_hitachi = 0;
            ii=ii+2;
			continue;
		}
		else {
			not_hitachi = 1;
			break;
		}
	}
 
	if (not_hitachi != 0) {
		printf("Yes\n");
	}
	else {
		printf("No\n");
	}
 
	return 0;
}