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: ['m', '3809', 'l', 'k', '1929', '7963', 'n', 'u', '2125', 'g', 'o', '8325', 'o', 'h', 'y', '3025', 'e', 'e', 'c', 'x', '8445', '4979', 'z', 'f', '4201', '4765', 'g']

A: c, e, f, g, h, k, l, m, n, o, u, x, y, z
****
Q: ['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: a, c, d, j, l, m, n, o, p, r, t, v, w, x, z
****
Q: ['s', 'f', 'k', 'u', 'o', '8207', '9857', 'f', '1045', '2683', '7447', 'v', 'o', 'o', '8195', 'z', 'o', '3895', '9467', '2631', 'v', 'q', 'o', '2273', '6203', '5553', 'n', '1737', '9791', 'g', 'v', '6005', '3089', '75', '1327', '7307', 'n', 'u', 'k', '4183', '8129']

A:
f, g, k, n, o, q, s, u, v, z
****