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(void)
{
	char str[11];
	scanf("%s",str);

	if(strcmp(str, "hi") == 0 || strcmp(str,"hihi") ==0||strcmp(str,"hihihi")==0||strcmp(str,"hihihihi")==0||strcmp(str,"hihihihihi")==0)
		printf("Yes\n");
	else
		printf("No\n");
	return (0);
}