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]: ['3147', '9807', '5313', '6311', '737', '1555', '5803', '3437', '5665', '3973', 'o', 'f', '7871', '1721', '7833', '2933', 'b', 'b', 'n', 'm', 'k']
[A]: b, f, k, m, n, o


[Q]: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']
[A]: d, e, g, l, m, o, p, q, s, t, v


[Q]: ['d', 'x', 'j', '5575', '6491', '3797', 'z', '8397', '9809', '9579', '9279', 'o', 'r', 'p', 'q', 'w', 'g', 'm', 'z', '7385', '1739', 'k', '7011', '3991', 'h', 'v', '3361', '3683', '775', 'x', 'g', 'b', '3585', '7883', '2137', 'h', '1391']
[A]:
b, d, g, h, j, k, m, o, p, q, r, v, w, x, z