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: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']
Example Output: g, h, k, l, o, t, y, z

Example Input: ['v', 'l', 'v', '7673', '8975', 'u', '2471', '4151', '3615', '1139', 'i', 'z', '8833', 'v', '341', 'l', 'n', 'l', 'd', '9207', '1861', '3901', 'a']
Example Output: a, d, i, l, n, u, v, z

Example Input: ['w', '4999', '2887', 'i', 'u', 'f', 'p', '6609', '1355', '6895', 'u', '3559', 'm', 'i', '3229', 'm', '241', 'q', 'b', 't', 'm', '7333', 'b', '7367', 'a', '2673', 'g', 'p', 'o', 'a', '8651', '9393', '9539', 'n', '5753', '7695', '3761', '9795']
Example Output:
a, b, f, g, i, m, n, o, p, q, t, u, w