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]: ['4417', 'x', '4641', '885', '8485', 'd', '7057', '8519', 'm', 'i', 'l', '4627', '3069', 'v', '5011', 'u', '6673', 'h', '4541', 'j', '2337', '8175', '4797', 'f', '9109', 'q', 'q']
[A]: d, f, h, i, j, l, m, q, u, v, x


[Q]: ['5039', '2227', 't', 'o', '3313', 'm', 'v', '637', '6773', 'v', 'c', 'l', 'y', 'u', '3823', '9669', 'k', 'h', '3589', 'b', 'i', '3833', 's', 'm', '8201', 'u', '3143', 'k', '4111', '9769', '425', '4339', '209', 'c', 'c', '669', '8201', 'u', '7443', '2387', '6919', 'b', 'b', '2873']
[A]: b, c, h, i, k, l, m, o, s, t, u, v, y


[Q]: ['l', 'g', '3561', '7723', 'p', 'v', '593', 'v', '567', '2985', '2963', 'f', '1283', 'q', 'n', 'l', '3435', 'o', 'h', 'z', 'j', '2993', 'x', 'u', '2285', 'c', 'd', 'v', '8825', '2599', '9181', 'e', '4717']
[A]:
c, d, e, f, g, h, j, l, n, o, p, q, u, v, x, z