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]: ['7073', 'd', 'e']
[A]: d, e


[Q]: ['f', 'j', '9195', '3155', '2855', '5333', '5263', '9279', '687', 'e', '3055', '7233', '13', 'j', 'p', 'i', '8327', 'm', 'h', '3977', 'h', '7997', 'a', 'h', '4661', 'x', '8237', 'a', '5009', 'o', 'p', 'z', '2293', 'q', 'p', '5469', 'k', 'q', 'b', 'n', '1967', '4991']
[A]: a, b, e, f, h, i, j, k, m, n, o, p, q, x, z


[Q]: ['1127', '7431', '7119', '4713', 'z', 't', '1739', 'g', 'o', 'v', '4173', 'r', '1715', '4271', '4777', 'p', 'a', 'x', '5417', '1937', '669', 'u', 'u', 'h', 'n', 'w', '1411', '641', 'p', 'y', 'j', 'k', '5731', '2269', '7735']
[A]:
a, g, h, j, k, n, o, p, r, t, u, v, w, x, y, z