with $\text{'}\text{'}($zero$)$ including the boundary line.

Note:

The outer rectangle is always made up of asterisks $\text{'}**\text{'}$

The inner rectangle is always made up of lowercase $x\text{'}x\text{'}$

The input should be taken from the standard input

cdots

$**$

$,**$

$**x,x**$

$**,x,x**$

$************************************************************************$

$******$

cdots

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

$x,x$

$x,00000000000000000000000000,x$

x $00000000000000000000000000x$

x $00000000000000000000000000x$

x $00000000000000000000000000$ x

x X X

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx