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:
['3821', '385', 'y', '8457', '6623', 'g', '5923', 'a', '7193', 'v', 'm', '8915', 'v', '5873', 'p', 't', 'w', 'y', '3617', 'h', 'w', 'j', '8047', 'u', '2271', 'v', 'a', '2181', 's', '1051', 'b', 'a', '9967', '987', 'z', '2255', '6349', '1249', '1397', 'q']

Ex Output:
a, b, g, h, j, m, p, q, s, t, u, v, w, y, z


Ex Input:
['j', '4405', 'z', '9965', '641', '6837', '997', '7463', '8993', '8495', 'f', '1041', '8951', 'e', 'z', 'q', '8575', 'i', 'l', 'j', 'i', 'x']

Ex Output:

e, f, i, j, l, q, x, z


