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.

[EX Q]: ['9271', '6393', '6005', 'x', '2301', '3999', 'p', 'z', 'j', '1033', '7555', 'r', 'r', 'y', '8917', '5939', '4031', 'e', '8095', 'g', '6095', 'a', '4133', '6471', '2129', '8021', '1093', 't', '8805', '545', 'k', '3249', 'l', '1561', '9909', 's', '1963', 'o']
[EX A]: a, e, g, j, k, l, o, p, r, s, t, x, y, z

[EX Q]: ['q', '8149', '4087', '5183', 't', 'j', 'e', 'g', 'r', '2125', 'y', 'l', 'g', '3673', 's', 'r', 'e', 'v', '4259', 'v', '3477', '9353', '3639', 'v', 'n', 'e', 'z', '5071', 'x', '6287', 'e', 'e']
[EX A]: e, g, j, l, n, q, r, s, t, v, x, y, z

[EX Q]: ['f', 'c', 'p', '7111', '8903', 'e', 'h', 'n', 'p', 'u', '9807', 'n', '3947', '115', '6685', '2623', 'd', '6241', 'p', 'd', 'u', '5357', '4591', 's', 'j', 'o', 'w', 'y', 'j', '5769', '175', 's', 'z', 'i']
[EX A]:
c, d, e, f, h, i, j, n, o, p, s, u, w, y, z