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]: ['9271', '6393', '6005', 'x', '2301', '3999', 'p', 'z', 'j', '1033', '7555', 'r', 'r', 'y', '8917', '5939', '4031', 'e', '8095', 'g', '6095', 'a', '4133', '6471', '2129', '8021', '1093', 't', '8805', '545', 'k', '3249', 'l', '1561', '9909', 's', '1963', 'o']
[A]: a, e, g, j, k, l, o, p, r, s, t, x, y, z


[Q]: ['d', '1625']
[A]: d


[Q]: ['5223', '9231', '9707', 'p', 'n', 'd', '3129', 'k', 'w', '2901', '9871', 'c', 'q', 'i', '8433', '3445', '5105', '8379', 'm', '2681', '491', 'b', '4123', '9255', 'a', 'r', '9945', '7805', '4643', '631', '179', '2811', 'r', '9995', 'd', '9081', 'f', '9521', 'h']
[A]:
a, b, c, d, f, h, i, k, m, n, p, q, r, w