PROGRAMMING:Graphic design

The meter shape consists of a (2n-1) ×( The matrix contains n letters starting from capital a
For example, when n = 3, it contains a, B and C; When n = 4, it contains a, B, C and D.
The middle of the matrix is the one with the largest lexicographic order among the n letters. Starting from this letter, there is a straight line composed of capital letters along the eight directions of northwest, north, northeast, West, East, southwest, South and Southeast. And the letters on the line decrease in lexicographical order until the capital letter A.
The other positions of the matrix are filled with English full stop.
Now Keven gives you a positive integer n and wants you to help him output this matrix. Can you help him?
###Input format:
Enter a positive integer n no more than 26 in one line
###Output format:
Output (2n-1) ×( 2n-1)
###Input sample 1:
```in
three
```
###Output sample 1:
```out
A.A.A
.BBB.
ABCBA
.BBB.
A.A.A
```
###Input sample 2:
```in
four
```
###Output sample 2:
```out
A..A..A
.B.B.B.
..CCC..
ABCDCBA
..CCC..
.B.B.B.
A..A..A
```







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