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]: ['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']
[A]: a, c, d, e, f, h, i, j, n, q, s, u, v, y


[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']
[A]: a, g, k, l, o, p, q, r, s, w, x


[Q]: ['w', 'z', 'g', 'v', '1021', '9347', 'g', 'n', 'e', '1429', 'q', 'c', '5227', 'h', 'j', 'm', 'j', 'd', '413', '1507', 'x', 'x', '3561', 'i', '7487', '6469', '6261', '9365', '4863', '6039', '4963', '4141', 'a', '6177', '3105', 'p', '8555', '1957', '4505', '8511', '9155', '4367', 'k']
[A]:
a, c, d, e, g, h, i, j, k, m, n, p, q, v, w, x, z


