Problem
You are given an integer, N. Your task is to print an alphabet rangoli of size N. (Rangoli is a form of Indian folk art based on creation of patterns.)
Different sizes of alphabet rangoli are shown below:
#size 3----c------c-b-c--c-b-a-b-c--c-b-c------c----#size 5--------e--------------e-d-e----------e-d-c-d-e------e-d-c-b-c-d-e--e-d-c-b-a-b-c-d-e--e-d-c-b-c-d-e------e-d-c-d-e----------e-d-e--------------e--------#size 10------------------j----------------------------------j-i-j------------------------------j-i-h-i-j--------------------------j-i-h-g-h-i-j----------------------j-i-h-g-f-g-h-i-j------------------j-i-h-g-f-e-f-g-h-i-j--------------j-i-h-g-f-e-d-e-f-g-h-i-j----------j-i-h-g-f-e-d-c-d-e-f-g-h-i-j------j-i-h-g-f-e-d-c-b-c-d-e-f-g-h-i-j--j-i-h-g-f-e-d-c-b-a-b-c-d-e-f-g-h-i-j--j-i-h-g-f-e-d-c-b-c-d-e-f-g-h-i-j------j-i-h-g-f-e-d-c-d-e-f-g-h-i-j----------j-i-h-g-f-e-d-e-f-g-h-i-j--------------j-i-h-g-f-e-f-g-h-i-j------------------j-i-h-g-f-g-h-i-j----------------------j-i-h-g-h-i-j--------------------------j-i-h-i-j------------------------------j-i-j----------------------------------j------------------
The center of the rangoli has the first alphabet letter a, and the boundary has the Nth alphabet letter (in alphabetical order).
Input Format :
Only one line of input containing N, the size of the rangoli.
Constraints :
- 0 < N < 27
Output Format :
Print the alphabet rangoli in the format explained above.
Sample Input :
5
Sample Output :
--------e--------------e-d-e----------e-d-c-d-e------e-d-c-b-c-d-e--e-d-c-b-a-b-c-d-e--e-d-c-b-c-d-e------e-d-c-d-e----------e-d-e--------------e--------