题目描述

在TeX中，左双引号是“``”，右双引号是“”。输入一篇包含双引号的文章，你的任务是把它转换成TeX的格式。

样例输入

"To be or not to be," quoth the Bard, "that
is the question".
The programming contestant replied: "I must disagree.
To `C' or not to `C', that is The Question!"

样例输出

``To be or not to be,'' quoth the Bard, ``that
is the question''.
The programming contestant replied: ``I must disagree.
To `C' or not to `C', that is The Question!''