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]: ['a', 'y', 'v', 'f', 'x', 'k', 'f', 'j', '6245', '6289', 'd', '6909', '8701', 'm', '3277', 'f', 'j', 'j', '9227', '8663', '5771', 'j', 'n', 'u', '7837', 's', '2539', '6363', 'g', 'a', '1009', 'v', '1483', 'x', 'i']
[A]: a, d, f, g, i, j, k, m, n, s, u, v, x, y


[Q]: ['r', '9489', 'e', 'n', '6323', 'd', '3163', '265', '8587', '7891']
[A]: d, e, n, r


[Q]: ['5613', 'a', '21', '3985', '1839', '7335', 'l', 'h', 'k', '9053', 'z', '8045', 'x', 'h', '9577', 'v', 's', 'a', '1545', '9223', 'z', '3399', 'x']
[A]:
a, h, k, l, s, v, x, z