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]: ['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']
[A]: b, f, g, j, q, r


[Q]: ['3743', '765', '5299', '3069', '8547', '8991', '1811', 'k', '5557', '4907', '5907', 'd', 'r', 'z', '5385', '5463', 'f', '2063', 'm', '3419', 'k', '3897', '4049']
[A]: d, f, k, m, r, z


[Q]: ['y', '1231', 'o', 'q', '8463', 'm', '5809', '9491', 'q', '3967', '8699', 'q', '6055', '2233', 'h', '1971', '2975']
[A]:
h, m, o, q, y