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.

hihi

Yes

hihi is the concatenation of two copies of hi, so it is a Hitachi string.

hi

Yes

ha

No