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]: ['d', 'p', 'k', '9679', 'x', 'j', '7481', '1815', 't', 'w', '6513', 'j', '5079', '5219', 'p', '9545', 'a', '1931', '9973', '8125', '5169', '2791', 't', 'd', '2057', 'e', 'x', 'y', '7409', 'u']
[A]: a, d, e, j, k, p, t, u, w, x, y


[Q]: ['i', 'y', '8339', 'd', 'b', '7471', '6577', '9037', '4503', '6287', '1439', '8863', '9201', '2661', 'x', 'l', 'v', 'w', 'a', 'f', '8885', '519', '7631', 'g', '7203', '8605', '2429', '9165']
[A]: a, b, d, f, g, i, l, v, w, x, y


[Q]: ['k', 'j', 'l', 'j', '3893', 'h', '6185', '291', '6255', 'r', 'x', 'c', '4705', 'l', '1295', 'a', '3015', 'e', 'a', '8751', '4787', '5247', '9965', 'b', 'f', 'f', 'w', 'e', 'e', 'l', '8383', 'p', 'c']
[A]:
a, b, c, e, f, h, j, k, l, p, r, w, x