def print_rangoli(n): 
   # step 1 - store letters of the alphabet
   alphabet = "abcdefghijklmnopqrstuvwxyz"

   # step 2 - get the first n letters of the alphabet
   first_n = alphabet[:n]

   # step 3 - draw the middle line
   middle = "-".join(first_n[::-1] + first_n[1:])

   # step 4 - get the length of the middle line
   length_of_middle = len(middle)

   # step 5 - draw upper half
   for i in range(1, n):    
       print("-".join((first_n[n:n-i:-1] + first_n[n-i:n]).center(length_of_middle, "-")))