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.

[Q]: ['6599', 'f', 'c', '661', 'q', 'e', '1951', 'f', 'f', 'a', 'd', '9521', '853', 'n', 'w', '6451', '5549', 'k', 't', 'l', 'z', 'm', 'k', '567']
[A]: a, c, d, e, f, k, l, m, n, q, t, w, z


[Q]: ['g', '6867', '7965', '3313', 'k', '1827', '7337', 'u', '1209', '5145', 'w', 'h', '9059', 'u', 'b', '3189', '2837', 'k', 'y', 'e', 'b', '4479', '541', '7103', 'h', 'm', '2177', '6377', '3993', '7167', 'q', '2145', '5007', '9135', '5331', 'e']
[A]: b, e, g, h, k, m, q, u, w, y


[Q]: ['c', '3863', 'y', '7589', '707', '2191', 'j', 'k', 'c', '1837', 'g', '2749', '1681', '3245', 'd', '9649', 'l', 'v', '713', 'c', 'u', 'g', 'a', 'a', 'm', '9113', 'j', 'j', '8767', '8953', 'f', '1451']
[A]:
a, c, d, f, g, j, k, l, m, u, v, y