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]: ['1487', '8003', 'd', '7237', 'l', 'y', '2749', 'e', '9685', '2825', 'z', '7743', 'r', '9617', 'w', '4323', '2173', '8419', '2831', '8923', 'l', '2985', '303', 'y', '9409', 'i', 'h', 'e']
[A]: d, e, h, i, l, r, w, y, z


[Q]: ['7055', '2573', '1713', 'x', 'm']
[A]: m, x


[Q]: ['9503', 'z', '207', '1877', '2451', '9697', 'u', '8663', '5443', 'u', 'e', 'h', '4173', 'l', 'b', 'h', '8185', '9901', '6473', 'f', '5875', 'v', 'l', 'w', '8665', 'n', 'e', '8629', 'x', '6155', '4353', '7381', 'c']
[A]:
b, c, e, f, h, l, n, u, v, w, x, z