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]: ['4857', 'z', '313', '7813', '9935', 'o', 'w', 'i', 'x', 'o', 'e', 's', 'a', 'p', 'i', 'v', 'x', '6743', 'p', '435', 'u', 'a', 'h', '607', '2491', '6159', 'u', '7761', '6197', '3449', '3459', 'e', 'g', '8731', '335', '2883', '3941', 'n', '1881', 'y', 'j', '8189', 'k', '7593', '2747']
[EX A]: a, e, g, h, i, j, k, n, o, p, s, u, v, w, x, y, z

[EX Q]: ['k', 'j', 'v', '5277', '8607', 'n', '1109', 'e', 'k', '6579', 'o', '2909', 'u', 't', '9685', '8443', '9257', '8071', 'y', 'b', 'h', '4767', 'a', 'j', '8455', 'b', '7733', '2553', 'e']
[EX A]: a, b, e, h, j, k, n, o, t, u, v, y

[EX Q]: ['d', '3015', '6575', 'l', 'y', '2271', '4323', '299', 'g', 'g', 'e', '3303', '7419', '2939', 'x', 'm', 'l', '2957', '4105', 'm', 'r', 'f', 'q', 'e', '9079', 'g', 'r', '6017', '2157', 's', '4077', '9533', 'v', 'g', 'm', '8423', 'b']
[EX A]:
b, d, e, f, g, l, m, q, r, s, v, x, y