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]: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']
[EX A]: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z

[EX Q]: ['p', '5229', '7521', 'y', 'n', 'u', 'c', '4047', '781', 'a', '4707', '7149', 'j', 'm', 't', '515', '7691', 'h', '4879', 'j', '6593', 'n', 'p', '2949', '1343', 'y', '2629', 'p', 'b', 'b', '2861', 'a']
[EX A]: a, b, c, h, j, m, n, p, t, u, y

[EX Q]: ['p', '7287', 'k', 'b', 'm', '8071', 'b', 't', '9357', 'p', 'q', 'l', 'x', 'd', 's', 'g', 'd', '4915', '1665', '6239', '3263', '2715', '9201', '6181', 'j', 'i', 'h', '4277', 'v', 'k', 'q', '69', '1463', 't', '2247', '4823', 'i', '7201']
[EX A]:
b, d, g, h, i, j, k, l, m, p, q, s, t, v, x