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: ['k', '8917', '3773', '6723', 'r', 'z', '3265', 'o', 'f', 'q', '9343', 'f', '1925', 'u', 'b', 'o', '5275', 'b', 'n', 'd', 'j', '4825']

A: b, d, f, j, k, n, o, q, r, u, z
****
Q: ['v', 'd', '3805', '8031', '3327', 'c', 'n', '6153', '2705', 'w', '5675', '6543', 'm', 'v', 'y', 'd', '2943', '4423', '515', '4501', 'y', '9377', 'j', 'i', 'f', '4749', 'o', 'r', '2605', 'm', '117', 'o', '9197', 't', 'l', '4145']

A: c, d, f, i, j, l, m, n, o, r, t, v, w, y
****
Q: ['6001', 'n', '9051', '3661', 'w', '2531', '551', 'g', '2185', 'r', 'j', '1447', '8459', '3405', '799', 'i', '1243', '5205', '6389', 'c', 'm', '9887', 'g', '9741', '8969']

A:
c, g, i, j, m, n, r, w
****