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', '2359', '6571', 'c', 'n', 'u', '9513', '9321', '1689', 'b', '969', '1823', 'e', 'b', '9147', 's', '1811', 'k', '5443', '8699', '5483', 'v', 'w', 'n', '1215']

A: b, c, d, e, k, n, s, u, v, w
****
Q: ['p', 'g', 'q', 'e', '8045', '9999', '9555', '7995', '7195', 'z', 't', '5223', '3699', 'i', '4797', '3817', 'x', 'y', 'w', 'o', '8915', '7803', 'n', '1117', 'c', '9647', 'p', 'e', '9669', '4845', '9255', '4545', '3693', '6871', 'w', '4327', '3285', 'k', 'f', 'x', 'i', 'b', '5967', '6601']

A: b, c, e, f, g, i, k, n, o, p, q, t, w, x, y, z
****
Q: ['k', '3171', 'i', '6951', 'j', '7467', 'q', 'z', '4121', 'z', '2853', '3927', '6259', 't', 'x', 'h', 'e', '1803', '9767', '2275', 'h', 't', 'a', '9251', 'j', 'o', '5111', 't', '7725', 'f', 'c', 'q', '7819', '8889', '6309', '9981', '7765', 'y']

A:
a, c, e, f, h, i, j, k, o, q, t, x, y, z
****