In this task, you are given an input list A comprising of numbers and alphabets. You need to extract and sort the unique alphabets in the list. The alphabets in the input list will only be in lowercase. Return -1 if there is no alphabet in the input list.

Ex Input:
['747', '5385', '5313', 'p', '9581', 'r', '1339', '3919', 'e', 'e', '8057', '7739', 'i', 'e', '3311', '963', 'g', 'h', '7349', 'y', '1493', 'e', '3055']

Ex Output:
e, g, h, i, p, r, y


Ex Input:
['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']

Ex Output:
c, f, j, k, o, y


Ex Input:
['k', '6573', '1775', 'm', 's', 'k', 'z', 'd', '4377', 's', 'k', '5693', 'f', 'r', '1059', '7735', 'p', '6137', 'u', 'u', '7733', 'l', 'z', '8493', 'u', '9349', '941', '383']

Ex Output:

d, f, k, l, m, p, r, s, u, z