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.

Input: Consider Input: ['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']

Output: a, d, i, j, l, o, p, q, s, u, v, w, x, y, z


Input: Consider Input: ['e', 'n', 'y', 'f', 'l', 'h', '455', 'y', '591', 'm', '9041', 'b', 'b', 'o', '4215', '5009', 'o', 'a', '4369', 'u', '6911', '4825', 't', 'k', '6063', '2939']

Output: a, b, e, f, h, k, l, m, n, o, t, u, y


Input: Consider Input: ['n', 'b', '8849', '4467', 't', 'l', 'y', 'e', '6319', 'm', '8017', 'q', '1901', '1939', 'v', '6101', 'r', 'g', 'j', 's', 'q']


Output: b, e, g, j, l, m, n, q, r, s, t, v, y