CF290E.HQ
普及/提高-
通过率：0%
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题目描述
The famous joke programming language HQ9+ has only 4 commands. In this problem we will explore its subset — a language called HQ...
输入格式
The only line of the input is a string between 1 and 106 characters long.
输出格式
Output "Yes" or "No".
输入输出样例
输入#1
HHHH
输出#1
Yes
输入#2
HQHQH
输出#2
No
输入#3
HHQHHQH
输出#3
No
输入#4
HHQQHHQQHH
输出#4
Yes
说明/提示
The rest of the problem statement was destroyed by a stray raccoon. We are terribly sorry for the inconvenience.