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]: ['f', '6817', 'f', 'd', '3835', '3051', 'u', 'l', '7679', 'b', '3931', '1441', 'q', '8675', 's', '5487', 'y', '2279', 'x', 'y', '9513', '2875', '1771', '879', '2927', '3469', 'v', 't', 'k', '9991', '2565', '7345', '973', 'w', 'i', '6105']
[A]: b, d, f, i, k, l, q, s, t, u, v, w, x, y


[Q]: ['p', '3981', 'e', '5949', 'p', '4075', '1919', 'w', 'r', '8059', '4303', 'f', '5201', '2255', '2737', '7395', '8809', 'j', 'z', 'n', '4797']
[A]: e, f, j, n, p, r, w, z


[Q]: ['8043', '5481', '1837', 't', 'r', '6007', '5455', 't', 'e', 'y', 'q', 'g', 'j', '9427', 'z', 'i', 'f', 'x', 'u', '8883', '2015', '9937', 'h', 'l', 'n', '3703', '8745', 'l', '293', 'j', 'f', 'a', '1871', '6861']
[A]:
a, e, f, g, h, i, j, l, n, q, r, t, u, x, y, z