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]: ['8281', '4831', '1329', 'g', 'e', '8879', 'n', 's', 'x', 'j', '6305', 'j', '921', '3677', '5107', 'n', 'j', '9285', 'a', '5329', '6671', 'c', '9283', 'l', 'a', '7907', 'q', '7605', '855', '6477']
[EX A]: a, c, e, g, j, l, n, q, s, x

[EX Q]: ['9483', '501', 'j', 'k', '3103']
[EX A]: j, k

[EX Q]: ['2995', 'j', 'l', '9415', '7121', 'r', 'b', '8545', '7733', 'z', '6435', '8123', '1731', 'h', 'l', 'h', 'd', 'r', 'l', 'z', 'm', 'i', '6575', 'l', '5177', 'p', 'w', '4981', '1109', '8807']
[EX A]:
b, d, h, i, j, l, m, p, r, w, z