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]: ['8859', '575', 'l', 'e', '6575', '1303', '8643', '1395', '3171']
[A]: e, l

[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]: ['o', 'f', '7869', '3643', '3415', '4637', '9137', '7397', 'c', 's', '2595', '4345', 'k', '7299', 'e', '1259', '4615', 'o', '3123', '5149', 'k', '3701', 'b', '415']
[A]:
b, c, e, f, k, o, s