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.

Example Input: ['4031', 't', 'o', 'c', 'x', '3007', '8329', '6345', '1267', '1017', 'o', 'x', 'l', '4129', 'd', '1987', '487', 'o', 'g', 'j', 'v', 'x', '3983', 'f', 'g', '5759', 'k', 'i', 'o', 'b', 'n', '683', 'j', 'o', 't', '4361', 'u']
Example Output: b, c, d, f, g, i, j, k, l, n, o, t, u, v, x

Example Input: ['4641', '2881', 'c', '4827']
Example Output: c

Example Input: ['2823', '127', '1617', '1267', 'p', 'l', '5403', 'g', 'b', 'o', 'n', 'c', 'l', 's', '4601', 'y', 'g', '4781', '6227', '1441', 'v', '8755', 'z', 'g', 'x', 'n', '7737', '2951', '9109', 'j', 'u', '3983', 'a']
Example Output:
a, b, c, g, j, l, n, o, p, s, u, v, x, y, z