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: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']

A: e, f, g, h, k, q, u, z
****
Q: ['8315', 'b', '4333', 'f', '6507', '6211', '3475', 'c', 'e', '8039', '661']

A: b, c, e, f
****
Q: ['6587', 'u', 'v', 'c', '8543', '5181', 'f', 'y', '5525', '1353', '8377', 'v', 't', 'g', 'n', 's', '8641', 'y', '3207', 'm', '6283', '8495', 'r', 'b', 'y', 'f', '2173']

A:
b, c, f, g, m, n, r, s, t, u, v, y
****