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[]){
    Scanner sc = new Scanner(System.in);
    //S
    String s = sc.next();
    String ans = "Yes";
    
    int sL = s.length();

    if (sL%2 == 0){
      if(sL==2 && (!(s.equals("hi")))){
            ans = "No";
      } else {
        for(int i = 0; i<sL-2; i++){
          String s1 = s.substring(i, i+2);
          if (!(s1.equals("hi"))){
            ans = "No";
            break;
          }
          i++;
        }
      }
     } else {
        ans = "No";
     }
    
    System.out.println(ans);
  }
}