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: ['3035', 'f', 'k', 'e', '3023', 'p', '9667', '5277', '4757', '8433', 'g', '1399', '7721', 'n', 'p', '7469', '7581', '5679', 'g', 'q']

A: e, f, g, k, n, p, q
****
Q: ['f', 'j', '9195', '3155', '2855', '5333', '5263', '9279', '687', 'e', '3055', '7233', '13', 'j', 'p', 'i', '8327', 'm', 'h', '3977', 'h', '7997', 'a', 'h', '4661', 'x', '8237', 'a', '5009', 'o', 'p', 'z', '2293', 'q', 'p', '5469', 'k', 'q', 'b', 'n', '1967', '4991']

A: a, b, e, f, h, i, j, k, m, n, o, p, q, x, z
****
Q: ['b', 'j', '5531', 'h', '347', 'x', 'x', '1485', 'e', '3907', 'l', '4825', 'q', 'f', '4023', '7777', 'y', 'n', 'r', 'b', '5977']

A:
b, e, f, h, j, l, n, q, r, x, y
****