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]: ['1945', 't', '4477', '4439', '6569', '2021', 'y', 't', '2725', '8947', '6921', '1373', '8107', 'g', 'c', 'w', 'x', 'b', '9117', 'k', '6567', '5073', '2307', 'e', 'b', '7405', 'e', 'x', '1419', 'd', 'o', 'n', 'a', '2647', 'z', '1459', 'n', '6137', 'u', 'b', 'q', '4459']
[A]: a, b, c, d, e, g, k, n, o, q, t, u, w, x, y, z

[Q]: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']
[A]: a, g, h, j, l, n, o, p, s, u, v, w, x

[Q]: ['9927', '2061', 'a', '175', '2561', '9093', 'f', '8675', 'x', '6979', 'g', '287', '9053', 'v', '4981', '7849', '7373', 'j', 'k', '5713', '8413', 'm', '7445', 'j', '415', '1717', '8999']
[A]:
a, f, g, j, k, m, v, x