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]: ['w', '1349', '3393', '7507', '2469', '8531', 'w', '6845', 'k', 'q', '2401', 'f', 'g', 'l', 'n', 'n', 'e', 'q', 'y', 'v', '3077', '4167', 'b', '5517', 'b']
[A]: b, e, f, g, k, l, n, q, v, w, y


[Q]: ['3611', '6825', 'j', 'e', 'r', 'a', '8889', 'y', 'x', 'k', '2651', '4545', '2289', 'r', 'q', '3163', 'a', 'i', 'j', 't', 'b', '2673', '4307', 'q', '5839', 'w', 'g', '6221', 'g', 'h', 'h', '5815', 'n', '3551', '7709', 'z', '2281', '7987', 'w', 'a', '2319', '3337', '3409']
[A]: a, b, e, g, h, i, j, k, n, q, r, t, w, x, y, z


[Q]: ['2975', 'i', '733', 'k', 'b', '6831', '5903', '1961', '5611', '8333', 'c', 'v', '4625', '8669', '7245', '9361', '5653', 'g', 'e', '7555', 'u']
[A]:
b, c, e, g, i, k, u, v