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 Q]: ['c', 'h', '8655', 'r', '7531', 's', 'r', 'w', 'e', 's', 'p', '1709', '5447', 'b', '5855', 'w', 'f', 'i', '7809', 'q', '1975', 'z', '4037', 'k', 'l', 'z', 'g', '9739', '8801', '3405', '6549', '4561', 'd', '1669']
[EX A]: b, c, d, e, f, g, h, i, k, l, p, q, r, s, w, z

[EX Q]: ['h', 'b', '9601', 'h', 'h', 'h', '8099', '8265', 'i', 'd', '8791', 'p', '8059', '4309', '501', '2581', '9837', '157', '4785', '5925', 'q', '8491', '4779', 'r', 'l', 'k', '3679', 'v', 'g', 'g', '9731', '1909', '9783', 'f', '4293', '5009', 'o', '3057', '3157', 'c', '5587', 'b', 'f', 'd', 'k']
[EX A]: b, c, d, f, g, h, i, k, l, o, p, q, r, v

[EX Q]: ['6711', 'x', '7783', 'y', '5393', '8775', 'p', '4009', '2605', 'g', '3049', 'o', '3427', 'n', '5879', 'g', '1179', 'x', '1229', '1447', 'm', '3093', 'v', 'q', '5913', 'z', '4501', 'h', 'q', 'w', '7433', '3405', 'd', 's', '9505', '6871', '3543', 'l']
[EX A]:
d, g, h, l, m, n, o, p, q, s, v, w, x, y, z