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.

Example Input: ['u', '4021', 'u', 'd', 'j', 'p', 'i', 'z', '3223', 'f', 's', 'l', 'p', 'd', '5031', '1059', '7875', '2097', 'q', 'i', '8813', '2017', 'h', 'l', 'y', '57', '1561', 'f', 'j', 'z', '1901', 'u', 'j', 'x', '6561', '9239', '3333', '8793', '4915', '5821', 'h', 'f', '765', 'x']
Example Output: d, f, h, i, j, l, p, q, s, u, x, y, z

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

Example Input: ['2785', '8999', '955', 'e', '9269', 'g', 'i', '2189', 'a', 'k', '7599', '2615', '8405', 'd', '9071', 'y', '2085', 'h', 'p', 'z', '5775', '8605', '6579', '5893', 'e', '5989']
Example Output:
a, d, e, g, h, i, k, p, y, z