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]: ['q', '8149', '4087', '5183', 't', 'j', 'e', 'g', 'r', '2125', 'y', 'l', 'g', '3673', 's', 'r', 'e', 'v', '4259', 'v', '3477', '9353', '3639', 'v', 'n', 'e', 'z', '5071', 'x', '6287', 'e', 'e']
[A]: e, g, j, l, n, q, r, s, t, v, x, y, z


[Q]: ['p', 'f', 'h', '1977', '6221', 'i', 'a', 'l', '5225', '8059', 'c', 'w']
[A]: a, c, f, h, i, l, p, w


[Q]: ['1717', 'd', 'v', 'v', 's', 'j', '5789', 'k', 'v', '9487', 'r', 'v', 'm', '4171', '4995', 'w', 'f', '6145', '9269', 'g', 'a', '4833', '4137', 'p']
[A]:
a, d, f, g, j, k, m, p, r, s, v, w