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: ['2943', 'k', '8519', '9103', 'j', '2461', '1049', '2211', '8761', 'l', 'e', '8939', '6013', 'r', '9089', '5781', '5383', '5495', '6699', '7307', '2733', '933', '9865', 'g', '6471', '3179', 'm', '8231', 't', 'e', 'u', '9909', 'g', 'g', '9431', '6521', 'y', 'g', '1415', 'e']

A: e, g, j, k, l, m, r, t, u, y
****
Q: ['4749', '4607', '625', '6907', 't', 'b', '8479', '6505', 'r']

A: b, r, t
****
Q: ['y', 'q', 'g', '9929', 'a', '7865', '9173', '5857', 'g', '6681', '4157', '2175', 'r', '47', 'p', 'n', '4363', '6791', 'p', '8349', '911', '1071', '7083', '7703', '9699']

A:
a, g, n, p, q, r, y
****