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]: ['3583', 'd', '1481', 'w', 'l', '7261', '2933', 'n', '8725', 'g', '3441', 'r', '287', '7327', '5637', 'r', '5389', 'm', 'j', 'd', 'a', 'e', 'v', '7879', '1731', 'z', '43', 'q', 'p', '4315', 'p', '3651', 'o', 'l', 's', '9787', 'h', '6735']
[EX A]: a, d, e, g, h, j, l, m, n, o, p, q, r, s, v, w, z

[EX Q]: ['b', 'a', '7411', '4471', 'z', 'l', '2051', 'q', '6749', '8647', 's', 'y', 'h', '9319', 'e', '5419', 'y', 'q']
[EX A]: a, b, e, h, l, q, s, y, z

[EX Q]: ['3175', 'g', 'r', 'l', 'g', '629', 'w', '8489', '7031', 'q', '3925', '9739', 'l', 'p', '4051', 'c', 'g', '7623', 'v', 'f', 'w', 'v', 'y', '7045', 't', '9385', 'r', '683', 'b', 'y', 'h', 'y', '1003', 't', '1957', 'e', '255', 'l', '1855', '8665', 'w', '3713', '2317']
[EX A]:
b, c, e, f, g, h, l, p, q, r, t, v, w, y