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]: ['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']
[EX A]: a, b, e, f, h, k, l, m, n, o, t, u, y

[EX Q]: ['9579', 'm', 'v', 'r']
[EX A]: m, r, v

[EX Q]: ['4035', 'b', '3399', 'r', '7731', '2047', '4687', 'e', 'w', '9873', '9437', 's', '839', '211', 't', 'x', 'r', 't', '6541', 'z', '8833', '7957', 'j', 'g', 'n', 'v', '8291', 'b', 's', 'a', 'q']
[EX A]:
a, b, e, g, j, n, q, r, s, t, v, w, x, z