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]: ['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]: ['h', 'g', 'j', 'i', 'y', '7799', 'y', 'e', 'y', 'e', '6757', '3349', '1213', '191', 'd', '2149', '849', '8325', 'b', '6087', 'w', '7211', '7801']
[EX A]: b, d, e, g, h, i, j, w, y

[EX Q]: ['4635', 'k', 'p', 'a', '1599', '8715', 'm', '5519', '405', '995', '1075', '7703', 's', '7081', 'y', 'y', 's', 'j', '2971', '7755', '4117', '6665', '6411', 'y', 'b', 'z', '2931', '5329', '9187', 'z', 'd', 'w', 'd', 'e']
[EX A]:
a, b, d, e, j, k, m, p, s, w, y, z