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]: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']
[A]: b, d, i, j, r


[Q]: ['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']
[A]: a, d, h, i, j, m, n, p, y


[Q]: ['f', '8537', '5259', '2919', 'd', 'a', '8467', '871', 'v', 'u', 'r', '8187', 't', '1083', '1219', '3247', 'k', '9915', 'a', 'v', '9317', '1737', '3261', 'x', '185', 'k', 'j', 'b', '5679', '821', 'e', 'z', '6527', '5931', '57', '2539', 'a', 'i', 'a', 'p']
[A]:
a, b, d, e, f, i, j, k, p, r, t, u, v, x, z