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]: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']
[EX A]: c, d, i, j, k, n, u, v, z

[EX Q]: ['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']
[EX A]: c, f, g, k, n, p, q, r, u, w

[EX Q]: ['i', 'j', 's', 'o', '1343', '4965', 'r', '243', 'b', '3145', '9689', '4679', '1931', 'c', 'e', 't', 'q', '437', 'j', 'u', 'u', 'u', '1391', '1873', 'c', '2193', '3803', 't', 'i', 'w', '81', '2077', 'i', 's', 'g', 'u', 'y', '9183', '5055', 'l', '7653', '7245', '9143', '2385', '4207']
[EX A]:
b, c, e, g, i, j, l, o, q, r, s, t, u, w, y