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]: ['p', 'p', '7899', 'u', '971', '7289', 't', '5217', 'k', 'z', 'y', 'y', '6905', '9499', '4085', 'x', '955', 'v', 'j', '9049', '7927', '1757', '193', '2181']
[EX A]: j, k, p, t, u, v, x, y, z

[EX Q]: ['a', 'y', 'v', 'f', 'x', 'k', 'f', 'j', '6245', '6289', 'd', '6909', '8701', 'm', '3277', 'f', 'j', 'j', '9227', '8663', '5771', 'j', 'n', 'u', '7837', 's', '2539', '6363', 'g', 'a', '1009', 'v', '1483', 'x', 'i']
[EX A]: a, d, f, g, i, j, k, m, n, s, u, v, x, y

[EX Q]: ['3969', '6819', '3729', '7957', '4045', '4595', 'y', '575', 's', '1441', 'c', 'q', 'c', 'k', 'o', '2749', 'w', '4079', 'g', '3863', 'u', 'x', 'b', '483', 'b', '91', '1481', 'z', '205', 'n', '4045', '3545', 'x', 't', 'q', '7459', 'u', 'e', 'i', '7475']
[EX A]:
b, c, e, g, i, k, n, o, q, s, t, u, w, x, y, z