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.

['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']
b, f, g, j, q, r

['o', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']
a, c, d, j, l, m, n, o, p, r, t, v, w, x, z

['6255', '3589', '629', 'a', '6085', 'o', 't', 'f', 'r', 'l', '7337', 'n', '9891', 'j', '1669', 'k', 'd', '4091', 'n', '1631', 'e', '2285', '417', 'b', '6291', 'l', '4943', 'w', '4273']

a, b, d, e, f, j, k, l, n, o, r, t, w