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.

[Q]: ['1983', '1835', '6543', '6399', '4177', '9385', '7127', 'p', 'l', 'u', 'g', 't', '3423', 'g', 'b', 'l', '3133', '2429']
[A]: b, g, l, p, t, u


[Q]: ['w', 'i', '4383', '7667', '9617', 'y', 'a', '8051', 'w', '4857', 'y', '3953', 'u', 'o', 'y', 'i', '9201', 'g', '1807', '5367', 'g', '5263', '3995', '6665', '3113', '9433', '6315', 'm', '845', 'x', 'c', 'v', 'h', '1491', 'g', '3519', 'x', 'b', '7695']
[A]: a, b, c, g, h, i, m, o, u, v, w, x, y


[Q]: ['7065', 'o', '4347', '3581', '6997', '9763', '3791', 'b', '9771', '2265', '2329', '1825', '2341', 'e', '7941', 'g', 'n', '7719']
[A]:
b, e, g, n, o