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]: ['h', 'v', '1263', 'y', '3299', 'd', 'a', 'h', 's', '2007', '7597', '1015', 'k', '6643', '6959', 'g', 'u', 'd', '5737', 'n', 'z', 'y', 'b', 'g', '9059', '7349', 'j', 'w', 'i', 'z', 'p', '5809', 'x', '4421', 'g', '6399', '3965']
[EX A]: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z

[EX Q]: ['m', '7517', '9361', '9567', '8785', 'k', '5699', '3585', 'v', '1913', '1651', 'g', 'p', '2731', 'q', 'h', '467', 'r', '1091', '9801', 'a', '6645']
[EX A]: a, g, h, k, m, p, q, r, v

[EX Q]: ['8261', 'h', '9201', 'd', 'e', '8081', '6789', 'w', 'h', '1991', '1661', '1461', '8455', 'n', '1379', 'x', '6919', '9417', 'n', '4271', 'j', '247', '2859', 'i', '9053', 'f', '7091', '2703', 'v', 'd', 'a', 'l', 'c', '387', 'p', '2717', 'g', 'r', '8235', '2865', '6491', 'a', 'x', '7637']
[EX A]:
a, c, d, e, f, g, h, i, j, l, n, p, r, v, w, x