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]: ['1985', '729', '169', '1299', 'l', 'z', '6809', '3083', 'w', 'f', '1989', 'z', '889', 'x', 'r', '1601']
[EX A]: f, l, r, w, x, z

[EX Q]: ['z', '4649', '4551', '8449', 'z', '7007', '5023', 'p', '2065', 'j', '1', 'e', '2377', '6165', '147', '3549', '5987', 'l', 'v', '6251', 'k', 's', '5235', '8435', 'q', '1971', 'w', '6845', '6487', 'j', 'f', 's', '3775', 'd', '2371', '2489', 'm', '1181', 'w', 'a']
[EX A]:
a, d, e, f, j, k, l, m, p, q, s, v, w, z