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]: ['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']
[EX A]: b, e, f, g, j, k, l, o, r, t, u, v, z

[EX Q]: ['d', '4377', '9271', '8053', '9519']
[EX A]: d

[EX Q]: ['9953', 'k', '9819', '3577', '147', '45', 's', 'b', 'u', 'u', '4455', '7297', 'h', '9339', 's', 'r', 't', 'j', 'e', 'e', 'l', 'r', 'u', 'r', '2519', 'x', 'f', 'b', 'n', '8397']
[EX A]:
b, e, f, h, j, k, l, n, r, s, t, u, x