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]: ['i', '1129', 'f']
[A]: f, i


[Q]: ['k', '6595', '1595', 'v', 'h', 'b', '8815', '6681', 'j', '7581', 'p', '9095', '5453', 'r', 'y', '7755', 'x', '1853', 'k', 'q', 'u', 'j', 'q', '9651', 'o']
[A]: b, h, j, k, o, p, q, r, u, v, x, y


[Q]: ['j', 'm', '439', '635', 'z', '3385', 'e', '6257', 'h', '251', 'g', '6441', 'p', '589']
[A]:
e, g, h, j, m, p, z