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]: ['7013', '8755', 'u', '9377', 'n', '6997', '507', '8557', '9745', 'g', '3019', '93', 'l', '1219', 'a', '393', '2573', 'q', 'b', '6101', 'e']
[EX A]: a, b, e, g, l, n, q, u

[EX Q]: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
[EX A]: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v

[EX Q]: ['y', 'b', 'p', 'w', '3315', 'w', 'm', '5997', 'c', '6363', 'y', 'i', '6793', '1397', 'p', 'f', '5139', 'i', 'k', '4061', 'e', '1989', 'm', '6345', 'y', '6165', '3583', 's', 't', 'j', '19', '6955', 'e', 'q', '8017', 'i', '6561', 'z', 'b', 'c', '6637', 'r', 'h', 'c']
[EX A]:
b, c, e, f, h, i, j, k, m, p, q, r, s, t, w, y, z