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]: ['7917', '2295', 'q', 'v', '9373', 'w', 'n', 'q', '5803', 'g', 'k', 'm', '2167', 'k', '6425', 'x', 'g', '341', 't', 'u', '8829', 'h', '4333']
[A]: g, h, k, m, n, q, t, u, v, w, x


[Q]: ['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']
[A]: c, e, g, h, i, j, l, m, r, s, v, w


[Q]: ['a', '8759', '4341', '7215', 'l', '4563', '1973', '3637', '4571', 'j', 'y', '6751', 'a', '9039', '6581', '8177', 'c', 'x', '557', '6841', '1489', 'v', '6177', '455', '5039', 'u']
[A]:
a, c, j, l, u, v, x, y