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

[EX Q]: ['p', 'p', '7899', 'u', '971', '7289', 't', '5217', 'k', 'z', 'y', 'y', '6905', '9499', '4085', 'x', '955', 'v', 'j', '9049', '7927', '1757', '193', '2181']
[EX A]: j, k, p, t, u, v, x, y, z

[EX Q]: ['7669', '6007', '8017', '6751', 'p', '4005', '3095', '8545', 'g', '5283', '5287', 't', '9941', '93', '3249', '2691', 'm', '3455', 'r', '1047', '8371', '7467', '9089', 'r', 'z', '4731', '1785', 'm', '8483', '2189', '9735', 'c', 'p', '4385', 'o']
[EX A]:
c, g, m, o, p, r, t, z