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]: ['277', '8697', 'q', '2023', '5723', 'm', '8673', 'f', 'z', 'z', 'a', '9875', 'p', 'x', 'l', 'z', 'x', '619', '6509', 's', '2067', '571', 't']
[EX A]: a, f, l, m, p, q, s, t, x, z

[EX Q]: ['8005', 'q', 'w', 'a', 'f', 'o', '6017', '7591', 'm', 'p', 'z', 'q', 'u', 'o', 'd', '6043', 'f', '3575', 'r', '2885', 'o', '3141', '621', '2375', 't', '5397', 'h', 'b', 'i', '3785', '1551', 'i', '8879', 'g', '5237', '7111', '2057', '1743', '9895', '2613', 'i', 'z', '677']
[EX A]: a, b, d, f, g, h, i, m, o, p, q, r, t, u, w, z

[EX Q]: ['6129', 'x', '3021', 'z', 'y', '7417', '3731', '9265', '2941', '3973', '4813', 't', 'u', 's', 'p', 'a', '7055', 'w', 'p', '545', 't', '6643', 'j', 't', 'c', 'r', '6663', 'h', '6367', '3041', '2235', 'p', 'e', 'l', '4597', '9385', 'k', 'c', '865', 'g', '1017', 'j', '4133', 'l']
[EX A]:
a, c, e, g, h, j, k, l, p, r, s, t, u, w, x, y, z