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Problems

Bowl for snowflakes

Bowl for snowflakes

Time limit 1 second
Memory limit 128 MiB

Given a positive integer n, print an image that has n rows and 2 * n - 1 columns, formed by the symbols snail, '*' and space, as shown in example.

7.jpg

Input data

One positive integer n (n > 1).

Output data

Print the image n * (2 * n - 1).

Examples

Input example #1
5
Output example #1
@*******@
 @*****@ 
  @***@  
   @*@   
    @