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: ['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']

A: d, e, f, j, k, r, u, v, w, x, z
****
Q: ['6411', 'x', 'i', '267', 'z', 'e', '5483', '8033', '3697', 'z', '4167', 'e', 'f', '7229', 'i', 't', '2197', 'g']

A: e, f, g, i, t, x, z
****
Q: ['d', 'f', 'g', '4163', 'f', '6569', '1787', '311', 'o', 'l', 'i', 'f', '2675', '5777', 't', '4505', 'b', 'j', '5573', '2807', '9225', '1859', '2609', 'u']

A:
b, d, f, g, i, j, l, o, t, u
****