HQ

Description:

Input:

The only line of the input is a string between 1 and 10⁶ characters long.

Output:

Output "Yes" or "No".

Sample Input:

HHHH

Sample Output:

Yes

Sample Input:

HQHQH

Sample Output:

No

Sample Input:

HHQHHQH

Sample Output:

No

Sample Input:

HHQQHHQQHH

Sample Output:

Yes

Note:

The rest of the problem statement was destroyed by a stray raccoon. We are terribly sorry for the inconvenience.