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 Python (3.4.3) (judge verdict: Accepted)


S = str(input())


if __name__ == "__main__":
    def func():
        h_pointer = False
        i_pointer = False
        check = True

        if(len(S)%2 != 0):
            print('No') 
            return

        for i in range(0, len(S) ):
            if(h_pointer and i_pointer == False and S[i] == "i"):
                h_pointer = False

            elif(h_pointer == False and i_pointer == False and S[i] == "h"):
                h_pointer = True
            else:
                print('No')
                check = False
                break
            
            # print(h_pointer, i_pointer, check)


        if check: 
            print('Yes')
    
    func()