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]: ['w', '9437', 's', '9819', 'q', 'q', '4443', 'p', '377', '6777', 's', 'x', 'a', 'o', '9205', '9289', '7103', 'k', 'l', '9453', '9043', 'k', 'r', 'g']
[EX A]: a, g, k, l, o, p, q, r, s, w, x

[EX Q]: ['4945', 'i', 'h', 's', '8925', 'i', '3995', 'f', '813', '1823', '3475', 'q', '2463', '9487', 'c', 'c', 'n', 'y', 's', '6269', 'a', 'u', 'd', 'd', '9291', '3187', '545', '7929', 'd', '1007', '7579', '8421', '4033', 'v', 'c', 'e', 'n', 'j']
[EX A]: a, c, d, e, f, h, i, j, n, q, s, u, v, y

[EX Q]: ['b', 't', 'j', '401', '5297', 'c', '255', 't', 'x', 'i', '2671', '6197', 'l', '8803', 'w', '6619', 'h', '7273', 'i', 'k', '2557', 'h', 'h', '6267', '6529', 'a', '8549', '413', 'e', '3045', 'q', '8763', '7475', 'd']
[EX A]:
a, b, c, d, e, h, i, j, k, l, q, t, w, x