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.

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

[EX Q]: ['815', '6967', '6553', 'r', 'y', '3641', 'q', 'b', '6131', '4289', 'w', '6093', '6055', 'i', 'b', 'y', '5107', 'v', 'g', '9709', 'x', 'i']
[EX A]: b, g, i, q, r, v, w, x, y

[EX Q]: ['4253', '5763', 'm', '2145', '4783', 'b', '7475', 'x', '9937', '253', 'f', '2861', 'n', 'k', '6273', '5279', '9533', 'u', 'j', 'n', '8711', 'm', 'p', 'z', '9899', '8267', 'i', '2813', '8367', 'v', '7909', 'u', '3503', '843', '4663', 'd', '1039']
[EX A]:
b, d, f, i, j, k, m, n, p, u, v, x, z