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]: ['k', '1995', 'b', '2581', 'x', '2639', 'i', '6761', '2701', 'd', '6993', '9375', 'r', 'm', '249', '8115', '8179', 't', '4901', 'i', '6197', '2809', 'e', 's', 'j', '4261', 'f', '6649', '7527', '3839', '5651', '9287', 'n', '2505', 's', 'q', '2825', 'g']
[A]: b, d, e, f, g, i, j, k, m, n, q, r, s, t, x


[Q]: ['n', '6615', 'r', 'q', '3803', '4641', '9775', '7719', 'n', '6571', '2723', '6919', 'e', 'f', '1919', '6963', '2581', 'y', '713', 'w', 'w', 'w', 'l', 's', '3993', '9563', '9365', '9277', '103', '2737', 'y', '6005', '9763', 'p', '261']
[A]: e, f, l, n, p, q, r, s, w, y


[Q]: ['o', 'a', 'a', 'p', 'n', 'q', 'j', '865', '1829', 'e', 'l', '3841', 'z', 's', 'd', 'h', 'a', '6559', '5611', '7443', 'l', '1545', '4659', '3219', '7791', 't', '9725', 'y', 'y', '4525']
[A]:
a, d, e, h, j, l, n, o, p, q, s, t, y, z