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]: ['t', 't', 'p', '3245', 'x', 'g', 'i', 'u', '2599', '8613', 't', 'v', 'p', '5635', 'y', '9567', '5193', '8617', 'q', 'f']
[A]: f, g, i, p, q, t, u, v, x, y


[Q]: ['g', 'p', '2925', 'n', 'o', 'y', '6381', 'l', '4963', 'g', 'm', 'u', 't', '9389', '3787', '7713', '1251', '779', 'i', 'w', '9869', 'y', 'y', '3881', 'k', 't']
[A]: g, i, k, l, m, n, o, p, t, u, w, y


[Q]: ['k', 'w', '8659', '8561', '6633', 'e', 'g', '7961', 'b', '9065', '301', 'n', '7641', 'a', 'y', '9935', '9259', '843', '9979', '7121', '511', 'q', '5549']
[A]:
a, b, e, g, k, n, q, w, y