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: ['c', 'a', 'p', 'p', '4203', '1587', '2953', '9809', '99', '5821', 't', 'i', '4213', '1809', 's', 'l', 'i', 'b', '9233', '3983', '7713', '1807', 'k', 'f', '7825', '5491', 'o', '1347', 'u', 'h', '3967', 'u', 'g', '6775', '1069', '9211', 'i', '3369', 'r']
Example Output: a, b, c, f, g, h, i, k, l, o, p, r, s, t, u

Example Input: ['7013', '8755', 'u', '9377', 'n', '6997', '507', '8557', '9745', 'g', '3019', '93', 'l', '1219', 'a', '393', '2573', 'q', 'b', '6101', 'e']
Example Output: a, b, e, g, l, n, q, u

Example Input: ['t', '1139', 'y', '7245', '7175', '4835', '3479', 'r', 'd', 'y', 'o', '8105', '8875', '583', 's', 'u', '3755', '6319', 'y', 'f', 'v', 'n', 'e', 'e', '2329', '7487', 'm', 'r', '7381', '4735', 't', 'd', 'v', '7741']
Example Output:
d, e, f, m, n, o, r, s, t, u, v, y