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: ['t', 'a', '2481', '2841', 'a', '2871', 'm', '4435', 'g', '8201', '4351', '9045', 'o']
Example Output: a, g, m, o, t

Example Input: ['w', 'g', '1649', 'a', '2115', '6763', 'r', 't', 'l', 's', 'y', '5659', 'a', 'b']
Example Output: a, b, g, l, r, s, t, w, y

Example Input: ['w', 'm', '7029', '4745', '2625', '3091', 'n', 'o', 'h', 'w', '3271', 'n', '1751', 'f', '4289', '8759', 'r', '9771', '161', '9481', '7943', 'v', 'e', '35', 'd', '3241', 'r', '8055', 'x', '3739', '8949', '1965', '9013', 'y', '1879', 'f', 's', '2725', '6617', '7343', '767', '6789', 'x', 'j']
Example Output:
d, e, f, h, j, m, n, o, r, s, v, w, x, y