HQ
题目描述
E. HQ
time limit per test
2 secondsmemory limit per test
256 megabytesinput
standard inputoutput
standard outputThe famous joke programming language HQ9+ has only 4 commands. In this problem we will explore its subset − a language called HQ...
Input
The only line of the input is a string between 1 and 106 characters long.
Output
Output "Yes" or "No".
Examples
Input
HHHH
Output
Yes
Input
HQHQH
Output
No
Input
HHQHHQH
Output
No
Input
HHQQHHQQHH
Output
Yes
Note
The rest of the problem statement was destroyed by a stray raccoon. We are terribly sorry for the inconvenience.
题目来源：fps-www.educg.net-codeforce-1-2833.xml.zip；FPS 共享题包，题包内第 2130 题。保留原作者与原赛事署名。