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]: ['m', 'z', 'd', '4667', 'v', '2881', '887', 's', '9861', 'd', '8821', '125', 't', '4493', '6749', '2983', '309', '6033', 'i', '3421', 'j', '4001']
[EX A]: d, i, j, m, s, t, v, z

[EX Q]: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']
[EX A]: c, d, e, f, l, n, p, q, t, u, v, y

[EX Q]: ['1991', '1199', '8305', '8379', '325', '8647', '7275', 'a', 'c', '8923', 'g', '3021', 'h', '2087', 'j', 's', 'n']
[EX A]:
a, c, g, h, j, n, s