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...
Input
The only line of the input is a string between 1 and 106 characters long.
Output
Output "Yes" or "No".
输入格式
见题面 Input 部分
输出格式
见题面 Output 部分
样例输入
HHHH
样例输出
Yes
提示
The rest of the problem statement was destroyed by a stray raccoon. We are terribly sorry for the inconvenience.