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]: ['1345', 'y', '7221', 'h', 'r', '3255', 'k', 'r', 'j', '8639', '467', 'f', 'k', 'n', 'k', 'j', 'l', 'w', '143', 'w', 'q', '5657', '589']
[A]: f, h, j, k, l, n, q, r, w, y


[Q]: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']
[A]: a, g, h, j, l, n, o, p, s, u, v, w, x


[Q]: ['5243', '3377', 'b', '8497', '219', 'j', 'o', '9043', 'g', 'u', '2971', '6119', '521']
[A]:
b, g, j, o, u