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]: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']
[A]: c, d, e, f, l, n, p, q, t, u, v, y


[Q]: ['x', 'z', 'k', '6703', '5687', '2187', 'g', '3189', '81', '5829', 't', '7515', '5901', '3029', '73', '2625', '2043', 'c', 'c', 'l', 'z', '9429', '2645', 'g', 'a', '9279', '6289', 'z', '8163', '4879', 'm', '5611', 'k', 'h', 'd', 'a', '7243', 'u', '4327', 'h', 'i', '2425', '6461', 'm', '1983']
[A]:
a, c, d, g, h, i, k, l, m, t, u, x, z