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]: ['o', 'd', '6495', '5211', '341', 'v', '385', 'v', 'g', 'v', 'l', '7631', '2675', 't']
[A]: d, g, l, o, t, v


[Q]: ['1945', 't', '4477', '4439', '6569', '2021', 'y', 't', '2725', '8947', '6921', '1373', '8107', 'g', 'c', 'w', 'x', 'b', '9117', 'k', '6567', '5073', '2307', 'e', 'b', '7405', 'e', 'x', '1419', 'd', 'o', 'n', 'a', '2647', 'z', '1459', 'n', '6137', 'u', 'b', 'q', '4459']
[A]: a, b, c, d, e, g, k, n, o, q, t, u, w, x, y, z


[Q]: ['4571', '771', 'y', '6589', '5041', '8559', 'h', '6607', '7099', 'w', 'j', 'w', 'o', 'z', 's', 'v', '4737', '5239', 'b', 'o', '2185', '6837', '5881', 'i', '525', '4579', '7541', 'i', 'm']
[A]:
b, h, i, j, m, o, s, v, w, y, z