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:
['w', '491', 'x', 'u', 'z', 'q', '5411', '7629', '8261', '8629', '1441', '5139', 's', 'm', '6463', 'u', 'z']

Ex Output:
m, q, s, u, w, x, z

Ex Input:
['277', '8697', 'q', '2023', '5723', 'm', '8673', 'f', 'z', 'z', 'a', '9875', 'p', 'x', 'l', 'z', 'x', '619', '6509', 's', '2067', '571', 't']

Ex Output:
a, f, l, m, p, q, s, t, x, z

Ex Input:
['c', 'r', 'i', 'f', '113', '2325', 'v', '5693', 'j', '4267', '1575', '7855', '5021', '1009', '8423', 'e', 'm', 'b', 'p', 'x', 'r', '9831', '2519', '9437', '7485', '2999', 'w', 'w', 'q', 't', 'x', '8583', '7027', '6209', '1823']

Ex Output:
b, c, e, f, i, j, m, p, q, r, t, v, w, x