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.

Input

Input is given from Standard Input in the following format:
S

Output

If S is a Hitachi string, print Yes; otherwise, print No.

Constraints

• The length of S is between 1 and 10 (inclusive).
• S is a string consisting of lowercase English letters.

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

见题面 Input 部分

见题面 Output 部分