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: ['f', '6817', 'f', 'd', '3835', '3051', 'u', 'l', '7679', 'b', '3931', '1441', 'q', '8675', 's', '5487', 'y', '2279', 'x', 'y', '9513', '2875', '1771', '879', '2927', '3469', 'v', 't', 'k', '9991', '2565', '7345', '973', 'w', 'i', '6105']

A: b, d, f, i, k, l, q, s, t, u, v, w, x, y
****
Q: ['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']

A: a, g, j, k, m, n, s, v, x
****
Q: ['x', '171', '2759', 'w', '8271', 'p', '1491', 's', '5047', 'a', '5871', 'q', 'g', '2487', '6977', 's', 't', '6635', 'm', 'r', '4885', 'k', 'h', 'z', 'm']

A:
a, g, h, k, m, p, q, r, s, t, w, x, z
****