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]: ['f', '7573', '2067', 'n', '3671', '7969', '7889', '4893', '6501', 'l', 'y', '4331', 'a', 'e', '2081', '3863', 't', 'j', '7921', 's', '7203', '7797', 'f', '4279', '1299', '987', '5003', '9071', '9559', '6061', '1889', '2653', 'm', 'w', '665', '7343', '9763', 'r', '6343', '9393', '9289']
[EX A]: a, e, f, j, l, m, n, r, s, t, w, y

[EX Q]: ['r', 'q', '3649', 't', '3941', 'z', '3729', 's', 'g', '6905', 'h', 'v', '1085', '6353', 'a', '9395', '5433', 'a', '2565', 'p', 'a', 'h', '1491', 'j', 'b', 'v', 'e']
[EX A]: a, b, e, g, h, j, p, q, r, s, t, v, z

[EX Q]: ['8069', 'i', 'g', '1315', 'v', '5969', 'e', 'e', '4957', 't', 'i', 'o', 'q', 'e', '9733', 'b', 'g', '2867', '3789', '5579', '3485', 'p', 't', 'y', 'w', '8353', '9697', '7139', 'd', 'w', 'd', 'y', '8947', 'y', '5265', '8469', '4353']
[EX A]:
b, d, e, g, i, o, p, q, t, v, w, y