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]: ['8311', 'w', 'f', '3431', '9863', '5817', '3969', '2705', 'x', 'm', 'k', 'z', 'z', '235', 'x', '417', 's', 'i', 'y', '8833', '8675', 's', 'm', '2149', '765', 'u', '1021', '7823', 'x', '7275', '3157', 'k']
[A]: f, i, k, m, s, u, w, x, y, z


[Q]: ['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']
[A]: a, d, h, i, j, m, n, p, y


[Q]: ['a', 's', 'f', '8973', 'y', 'j', 'c', '8543', 'p', '9023', 't', 'p', 'f', '3969', '9211', '9501', '5483']
[A]:
a, c, f, j, p, s, t, y