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.

[Q]: ['q', '8149', '4087', '5183', 't', 'j', 'e', 'g', 'r', '2125', 'y', 'l', 'g', '3673', 's', 'r', 'e', 'v', '4259', 'v', '3477', '9353', '3639', 'v', 'n', 'e', 'z', '5071', 'x', '6287', 'e', 'e']
[A]: e, g, j, l, n, q, r, s, t, v, x, y, z


[Q]: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
[A]: a, f, q, v, x


[Q]: ['9083', 'g', 't', 'd', 'm', '5721', '2325', 'b', 'g', '2621', '7579', 't', '3693', 's', '5377', 'g', '4355', 'd', '8609', '6271', '2601', 'h', 'p', 'c', 'b', 'd', 't', '8589', '7165', 'd', 'n', 'h']
[A]:
b, c, d, g, h, m, n, p, s, t