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:])