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]: ['o', '4167', 'b', '1651', '8327', '9219', 'o', 'v', '5841', '6057', 'i', 'q', 'o', 'r', 'a', '7069', 'y', 'h', 'd', '3775', 'j', 't', '3663', '55', '7117', 'e', 'u', 'm', '931', '5777', '8773', '4891']
[A]: a, b, d, e, h, i, j, m, o, q, r, t, u, v, y


[Q]: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']
[A]: g, h, k, l, o, t, y, z


[Q]: ['8087', '6587', 'y', 'x', '9233', '9831', '7733', '7249', 'g', 'f', '8265', 'x', 'z', 'a', '7413', 'w', 'f', '4001', 'm', '1365', '5595']
[A]:
a, f, g, m, w, x, y, z


