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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)


import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		char []c = sc.next().toCharArray();
		
		boolean flag = true;
		
		if(c.length% 2== 1) {
			System.out.println("No");
			return;
		}
		for(int i = 0 ;i < c.length ;i++) {
			if(i % 2 == 1) {
				continue;
			}
			if(c[i] != 'h' || c[i+1] != 'i') {
				flag = false;
				break;
			}
		}
		
		if(flag) {
			System.out.println("Yes");
		}
		else {
			System.out.println("No");
		}
	}

}