We almost overlooked one thing — Princess Asseylum needs to give her guests gifts! You have to help her wrap the gifts now! A wrapped gift can be represented as an ~M \times M~ square matrix of lowercase letters. The very center of the gift should be
a, and each other layer from inside out should have
The first and only line of input will have the number of layers of the gift, ~N~ ~(1 \le N \le 26)~.
You should output an ~M \times M~ matrix, the gift after it is wrapped.
Sample Input 1
Sample Output 1
bbb bab bbb
Sample Input 2
Sample Output 2
ccccc cbbbc cbabc cbbbc ccccc