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:
['c', '6027', 'o', 'h', 'l', '7893', 'u', 'f', '7661', '4715', '1373', '4799', 'd', 'z', '411', '4753', 'd', '8241', '1589', '4173', '3921', 'j', 'o', '5067', '8879', 'e', 'm', '9543', '9625', '855', 'u', 'd', '5859', '4243', '5747', '5147', '7315', 'd', 'x', 'q', '7841', '7397', 'm']

Ex Output:
c, d, e, f, h, j, l, m, o, q, u, x, z


Ex Input:
['l', '6819', '1029', '2925', '2361', '5545', '2151', '2681', 'f', 'p', '1263', '2875', 'b', '4665', 'f', 'g', 'p', '4829', '8453', 'z', 'l', '4219', '7517', '25', 'a', '5099', '3693', 'i', '1815', '1541', 'g', '7665']

Ex Output:
a, b, f, g, i, l, p, z


Ex Input:
['8087', '6587', 'y', 'x', '9233', '9831', '7733', '7249', 'g', 'f', '8265', 'x', 'z', 'a', '7413', 'w', 'f', '4001', 'm', '1365', '5595']

Ex Output:

a, f, g, m, w, x, y, z