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]: ['a', 'p', 'y', 'l', 'l']
[EX A]: a, l, p, y

[EX Q]: ['3651', 'c', 'm', '7123', '2981', '9649', 'o', '2181', 'h', '8577', 'a', '5027', 'x', 'u', '1039', '347', '8219', 'c', '1063', '8885', 'f', 'd', '3067', '2509', 'i', 's', '5509', '2003', 'h', '8869', 'x', 'd', '5141', 'h', 'i', 'b', 'o']
[EX A]: a, b, c, d, f, h, i, m, o, s, u, x

[EX Q]: ['h', '4167', '8603', 'm', '3953', 'd', 'w', '7473', '5769', 'w', 'j', 'c', 'c', '9895', 'k', '8813', '6723', 'y', '5377', 'b', 'w', '8365', '4243', '4835', '5823', '7885', '373', 'e', 'c', '8367', 'e', 'r', '5787', '6407', '9027']
[EX A]:
b, c, d, e, h, j, k, m, r, w, y