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]: ['2705', 'n', 'r', '8259', '6839', '3239', 'w', 'z', '2611', '2957', '2303', '6315', '7801', 'c', 'w', 'm', '5049', '6465', '599', 'h', 'q', '7559', 'n', '9917', 'v', 'l', '643', '6415', '3587', 'c', '917', '4435', 'p', 'a', '317']
[EX A]: a, c, h, l, m, n, p, q, r, v, w, z

[EX Q]: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']
[EX A]: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u

[EX Q]: ['h', 'w', '5721', '3081', 'v', '6593', '1685', '5103', '4813', 'x', '3547', 'k', '7551', 'n', '7919', '4445', 's', '7709', 'e', 'x', 's', '3299', 'w', '8113', '6051', '7581', '7307', '9817', 't', '2033', '5567', 't', '1475', '4805', '7437']
[EX A]:
e, h, k, n, s, t, v, w, x