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]: ['1063', 'f', 'm', 'i', 'x', 'i', 'd']
[EX A]: d, f, i, m, x

[EX Q]: ['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']
[EX A]: c, e, g, h, i, j, l, m, r, s, v, w

[EX Q]: ['w', '849', 'l', '5063', '9359', 'c']
[EX A]:
c, l, w