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]: ['x', 'i', 'k', 'c', 'f', '3057', '481', '5887', '847', 'c', 'x', 't', 'g', '5805', 'a', 'i', '2885', '403', 'x', 'c', '4815', '2765', 'c', '5181', 'l', 'e', '3843', '1171', 'u', '7867', 'z', 'e', '9349', '5011', 'h', 'x', '3193', 'i', '4595', '8621', '6007', '1879']
[EX A]: a, c, e, f, g, h, i, k, l, t, u, x, z

[EX Q]: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']
[EX A]: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z

[EX Q]: ['e', 'l', '3589', 'p', 'i', '8095', 'c', 'd', '3681', '1895', 'f', 'u', 'k', '2943', '213', 'v', '1707', 'o']
[EX A]:
c, d, e, f, i, k, l, o, p, u, v