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]: ['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']
[EX A]: a, d, h, i, j, m, n, p, y

[EX Q]: ['3821', '385', 'y', '8457', '6623', 'g', '5923', 'a', '7193', 'v', 'm', '8915', 'v', '5873', 'p', 't', 'w', 'y', '3617', 'h', 'w', 'j', '8047', 'u', '2271', 'v', 'a', '2181', 's', '1051', 'b', 'a', '9967', '987', 'z', '2255', '6349', '1249', '1397', 'q']
[EX A]: a, b, g, h, j, m, p, q, s, t, u, v, w, y, z

[EX Q]: ['x', 'u', '4657', '2975', 'f', '7095', 'm', 'y', 'g', 'g', '8365', 'v', '829', 'g', 's', 'v', '3737', 'l', '7859', 'h', 'b', 'z', '9163', 'z', 'o', 'w', '8389', 'r', '2183', 'c', 'g', 'o', 'c', '7695', '8609']
[EX A]:
b, c, f, g, h, l, m, o, r, s, u, v, w, x, y, z