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: ['a', 'p', 'y', 'l', 'l']

A: a, l, p, y
****
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: ['b', 'm', '6475', '5545', '7075', '5941', '9333', 'p', 'o', 'j', '2711', 'e', 'e', '8959', 'p', 'g', '361', '3613', '8877', 't', '5237', '3949', 'z', 'b', '161', 'e', '5801', 'm', 'e', '4649', '3227', '1117', 'f', 'x', 'f', '7649', 'q', 'e', '701', '3863', '1761', 'a', 'm', 'o', '8631']

A:
a, b, e, f, g, j, m, o, p, q, t, x, z
****