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]: ['5433', '4011', '2113', '2299', 'e', '9829', 'd', 'q', 'e', '3921', 'a', 'q', '8953', 'q', 'g', 'w', 'z', 'u', '4425', 'b', 'q', '5315', 'b', 'u', 'h', 'y', '9733', 'b', 'c', '1225', 'a']
[A]: a, b, c, d, e, g, h, q, u, w, y, z


[Q]: ['3947', '4809', 'b', 'a', '4769', '4179', '535', '5965', 'f', 'j', '2265', 'w', '3103', 'u']
[A]: a, b, f, j, u, w


[Q]: ['f', '5591', 'z', '9031', '7871', '5767', '1919', 'd', 'm', 'n', '7269', '6485', 'j', 'y', '205', '9041', '4575', 'm', 'u', '5747', '9261', 'u', '4661', '4051']
[A]:
d, f, j, m, n, u, y, z