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.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        String s = sc.next();
        String[] sp = s.split("");
        boolean ans = true;
        if(sp.length % 2 == 0) {
            for(int i=0; i<sp.length-1; i+=2) {
                if(sp[i].equals("h") && sp[i+1].equals("i")) {
                    continue;
                }else {
                    ans = false;
                    break;
                }
            }
        }else {
            ans = false;
        }
        
        if(ans) System.out.println("Yes");
        else System.out.println("No");
    }
}