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]: ['4637', 'f', '2639', '8623', 'w', 'e', 'k', '5503', 'x', '6633', '7553', '1455', 'u', '1773', 'r', 'u', '1489', 'u', '1303', '9683', 'z', '565', '7041', 'x', 'z', '9431', 'k', 'v', 'j', 'z', '5469', '5665', '4089', '4951', '8263', '5675', '4095', '7745', 'z', '2437', 'd', 'e', 'w']
[A]: d, e, f, j, k, r, u, v, w, x, z


[Q]: ['315', '9975', '3013', 's', '6131', 'e', 'e', 'u', 'a', '1729', 'g', 't', 'y', 'f', '7523', 'e', 'g', '489', 'm', 'p', 'f', 'e', '2077', 'e', 'g', 'c', 'l', '6389', 'k', 'b']
[A]: a, b, c, e, f, g, k, l, m, p, s, t, u, y


[Q]: ['2411', '4961', 'm', '7491', 'n', '6935', 'k', 'h', '251', 'z', '2733', 's', '1239', '5335', 'h', '6743', 'z', 'i', 'z', '1479', '1699', '3245', '2765', '6971', '4321', 'l']
[A]:
h, i, k, l, m, n, s, z