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]: ['2349', 'p', 'a', '435', 'y', 'h', '3249', 'o']
[A]: a, h, o, p, y


[Q]: ['5075', '9169', '4659', '7605']
[A]: -1


[Q]: ['621', 'd', 'c', '1191', '3249', '2001', '2205', '7571', '8785', '2533', '9407', '9771', 'l', 'v', 's', 'c', '4245', '5845', 'v', '3961', 'j', 'z', 'c', '9129', 'k', '211', '1169', '5229', 'u', 'x', '7237', 'k']
[A]:
c, d, j, k, l, s, u, v, x, z