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]: ['q', 'c', 'o', 'e', 'n', 'q', 'w', '9475', 'w', '863', 'r', '2219', '3483', '5035', '8209', '7957', 'b', '3735', '1423', 'l', '3409', '7639', 'd']
[EX A]: b, c, d, e, l, n, o, q, r, w

[EX Q]: ['u', '9249', 'u', 't', 'm', 'm', 'n', 'w', '8617', '2729', 'i', 'l', '2971', '3227', 'b', '9017', '4711', 'i', 't', 'r', 'a', 'a', '1701', '6397', '4535', '9167', '6039', '6111', '849', 'p', '8197', '2645', '5147', 'u', 'l', '7419', 'w', 'w', 'k', 'x', 'c', '3377', '4015', '1297', 'f']
[EX A]: a, b, c, f, i, k, l, m, n, p, r, t, u, w, x

[EX Q]: ['p', 'x', 'f', 'j', '5231', '2719', '369', 'a', 'i', 'e', '6271', 'b', 'k', 'w', 'm', 'a', '4885', '719', '8557', 'w']
[EX A]:
a, b, e, f, i, j, k, m, p, w, x