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]: ['p', 'g', 'q', 'e', '8045', '9999', '9555', '7995', '7195', 'z', 't', '5223', '3699', 'i', '4797', '3817', 'x', 'y', 'w', 'o', '8915', '7803', 'n', '1117', 'c', '9647', 'p', 'e', '9669', '4845', '9255', '4545', '3693', '6871', 'w', '4327', '3285', 'k', 'f', 'x', 'i', 'b', '5967', '6601']
[EX A]: b, c, e, f, g, i, k, n, o, p, q, t, w, x, y, z

[EX Q]: ['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']
[EX A]: d, e, h, k, l, n, o, q, r, u, z

[EX Q]: ['c', '5443', 'm', '7359', 'd', '6003', '6125', 'v', '8471', 'v', '7617', 'f', '6341', 'e', '6391', 'y', 'l', '8413', 'm', 'e', 'x', '4475', '9003', 'g', 'i', '4985', '7735', '5741', '1093', 'x', 'q', 'h', 's']
[EX A]:
c, d, e, f, g, h, i, l, m, q, s, v, x, y