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: ['3043', 'r', 'm', 'i', '2653', 'i', '1703', '1125', '6299', '4863', 'n', 'h']

A: h, i, m, n, r
****
Q: ['e', 'z', '5199', 'x']

A: e, x, z
****
Q: ['6649', '745', 'e', '3173', '9947', 'r', '2255', 'g', '8749', 'v', '1079', 'z', 'o', '3583', 'h', 'o', 'z', '965', 'm', 'c', 'z', '5963', 'a', '353', '1653', 'w', '6547', 'b', '3355', '7515', '5547', 'e', '8325', '585']

A:
a, b, c, e, g, h, m, o, r, v, w, z
****
