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]: ['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']
[A]: a, c, h, l, m, n, p, q, r, v, w, z


[Q]: ['d', 'o', '7643', '9065']
[A]: d, o


[Q]: ['4017', '315', '2219', '8223', 'i', '9915', 'g', '6221', 'x', '2027', '2895', 'z', 'c', 'w', '6817']
[A]:
c, g, i, w, x, z