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]: ['231', 'r', '5673', 'j', '589', 'z', '4659', 'a', '3763']
[A]: a, j, r, z


[Q]: ['6627', '8037', 'q', 'e', 'j', 'p', '9613', '9317', 'm', 'm', '5345', 'f', '8105', '5665', '4175', '4793', '3707', 'i', 'b', '6745', '747', '8329', '1481', 'b', '8949', 'n', '4803', '1359', '3533', 'f', '543', '3003', '6943']
[A]: b, e, f, i, j, m, n, p, q


[Q]: ['5163', '1017', 'k', '2277', '1375', '5235', 'u', 'z', 'b', '4187', '2641', 'p', 'e', 'n', '7341', 'f', '4383', '1561', '5341', '2727', 'a', 's', 'v', 'j', 'l', '4121', '9289', '957', 'g', 'c', 'n', '9969', '8477', 'o', 'u', '6411', '2359', '3581', '9541', 'f', 'a', '9873', '627']
[A]:
a, b, c, e, f, g, j, k, l, n, o, p, s, u, v, z