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: ['5345', 'f', '6605', 's', 'q', 'w', 'p', 'o', 's', 'u', 'i', '7339', '8379', 'h', '9547', 'b']

A: b, f, h, i, o, p, q, s, u, w
****
Q: ['m', '8325', 'h', '5891', 'h', '8979', '5145', 'r', 'd', '8415', 'b', '3583', 'd', '6449', 'x', 'o', '2697', '1449', 'a', '961', 'i', 'e', 'g', '1855', 'n', '3163', '4525', 'n', 'x', 'k', '4633', '1947', '6679']

A:
a, b, d, e, g, h, i, k, m, n, o, r, x
****