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]: ['277', '8697', 'q', '2023', '5723', 'm', '8673', 'f', 'z', 'z', 'a', '9875', 'p', 'x', 'l', 'z', 'x', '619', '6509', 's', '2067', '571', 't']
[A]: a, f, l, m, p, q, s, t, x, z


[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]: ['5819', 'x', 's', 'z', 'r', '9923', '3809', 'k', '6401', '1003', '8751', '8055', '1043', '7283', 'z', '8165', '571']
[A]:
k, r, s, x, z