Description

输入一个正整数𝑛和一个字符。 输出一个2 × 𝑛 + 1行由该字符组成的空心菱形。

Format

Input

一个整数n和一个字符

Output

按要求画出以该字符填充的空心菱形

Samples

4 @

    @
   @ @
  @   @
 @     @
@       @
 @     @
  @   @
   @ @
    @