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.

['j', 's', 'z', 'v', '5401', 'u', '8859', 'i', 'l', 'a', 'p', 'v', 'v', 'o', '3969', '4091', 'y', '6827', '1799', '5163', 'd', 'w', '4795', '5167', 'x', 'q', '2903', '1171', '5279', '449', '7901', 'u']
a, d, i, j, l, o, p, q, s, u, v, w, x, y, z

['i', '9215', 'n', 'p', '4815', '8757', 'm', '1755', 'c', 'z']
c, i, m, n, p, z

['3589', 'z', '9299', 'j', 'v', '4221', 'z', '4443', 'h', 'g', '6615', 'k', 'j', 'l', '1745', '1399', 'v', '6089', 'g', 'y']

g, h, j, k, l, v, y, z