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: ['7013', '8755', 'u', '9377', 'n', '6997', '507', '8557', '9745', 'g', '3019', '93', 'l', '1219', 'a', '393', '2573', 'q', 'b', '6101', 'e']

A: a, b, e, g, l, n, q, u
****
Q: ['7065', 'f', 'k', 'i', 'd', '8291', 'z', 'e', 'q', '5345', 'h', '3397', 's', '5355', 's', '9033', 'e', '5241', '5285', 'm', 'h', 'i', 'n', '6471', '3365', 'f', 'r', '6145', 't', '4869']

A: d, e, f, h, i, k, m, n, q, r, s, t, z
****
Q: ['6175', 'd', 'x', '9609', 'k', 'n', 'b', '6539', 'x', '1163', 'y', 'v', '725', 's', 'w', 'e']

A:
b, d, e, k, n, s, v, w, x, y
****