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 s=new Scanner(System.in);
        String ss=s.next();
        int ff=0;
        for(int j=0;j<ss.length();j++){
            if(j%2==0 && ss.charAt(j)!='h'){
                ff=1;
                break;
            }
            else if(j%2==1 && ss.charAt(j)!='i'){
                ff=1;
                break;
            }
        }

        if(ff==1 || ss.length()%2==1){
            System.out.println("No");
        }
        else{
            System.out.println("Yes");
        }
    }
}