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]: ['8829', 'm', '5369', 'q', '5737', '7799', '5705', 'p', 'w', '1983', '4849', 'h', '6771', 'p', 'y', '1071', 'u', '6401', '7723', 'p']
[EX A]: h, m, p, q, u, w, y

[EX Q]: ['5785', 'c', 'f', '7087', 'd', '9225', 'm', 'g', '4639', '7165', '3445', '3813', 'p', 'i', '719', 's', 'g', '6423', '9563', 'w', 'm', '8659', '8809', '4105', '3923', '465', '5637', '5547', 'h', 'v', '9453', '4009']
[EX A]: c, d, f, g, h, i, m, p, s, v, w

[EX Q]: ['v', '75', 'd', '9515', '5997', 'u', '9125', 'f', '6117', '403', '8759', 's', '9913', '2867', '3725', 'y', '9263', '4569']
[EX A]:
d, f, s, u, v, y