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: Wrong Answer)

import java.util.*;
public class Main{
	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		boolean t = false;
		
		for(int i=0; i<s.length()-1; i++) {
			if(t == true) {
				break;
			}
				
			if(s.charAt(i)=='h'&&s.charAt(i+1)=='i') {
				t = true;
			}
		}
		if(t == true) {
			System.out.println("Yes");
		}else {
			System.out.println("No");
		}

	}
}