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]: ['z', '3219', '6399', '2357', '7597', '357', 'k', 'k', 'u', 'd', '6115', 'w', '2921', '8809']
[EX A]: d, k, u, w, z

[EX Q]: ['3395', '7471', 'n', '9537', '1255', '1997', '3085', '4863', '9797', '4275', 'k', 'f', '8973', '3939', 'p', 'q', '4977', '6231', '8745']
[EX A]: f, k, n, p, q

[EX Q]: ['d', '4115', '9739', 'u', '5071', '3985', '7515', '9333', 'd', '5065', '5955', '2233', 'i', '4223', '9631', '233', 'z', '8391', 'q', '2113', 't', 's', 'x', 's', 'x', 'h', 'd', '2671', 'o', 'g', '3621', '8379', 'k', '2749', '4743', '4413', '4637', 'w', '8523', '413', '9359', '9763']
[EX A]:
d, g, h, i, k, o, q, s, t, u, w, x, z