HQ
Description
The famous joke programming language HQ9+ has only 4 commands. In this problem we will explore its subset — a language called HQ...
The only line of the input is a string between 1 and 106 characters long.
Output "Yes" or "No".
Input
The only line of the input is a string between 1 and 106 characters long.
Output
Output "Yes" or "No".
Samples
HHHH
Yes
HQHQH
No
HHQHHQH
No
HHQQHHQQHH
Yes
Note
The rest of the problem statement was destroyed by a stray raccoon. We are terribly sorry for the inconvenience.