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]: ['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']
[EX A]: b, d, i, p, r, t, u, v, w, y, z

[EX Q]: ['f', 'a', 'r', '4009', 'k', 'a', 'g', '7725', 'v', 'b', '6705', 'a', '6583', '3159', 'c', 'w', 'x', 'h', '7625', 'p', 'y', '5645', 'k', 'r', 'j', '4175', 'r', '3103', '8631', '5999', 'p', 'g', 'h']
[EX A]: a, b, c, f, g, h, j, k, p, r, v, w, x, y

[EX Q]: ['b', '2983', '1633', '9315', 'e', 'h', '2949', '4311', 't', '1761', 'v', '6597', '9001', '8085', '769', 'm', '8839', '9069', '3005', '5543', 'q', 'j', '6535', '7663', '7387', '631', '7049', 'l']
[EX A]:
b, e, h, j, l, m, q, t, v