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: ['u', 'k', 'd', '4393', 'u', 'h', 'q', '833', 'k', 'l', '5749', 'r', '7123', '1003', 'z', '531', 'o', 'u', '6601', '6975', '4905', 'n', 'e']
Example Output: d, e, h, k, l, n, o, q, r, u, z

Example Input: ['i', '4993', '1621', '9383', 'r', 'k', '7257', '4535', '563', 'h', 'w', 'k', '7289', '9635', 'm', 'p', 'b', '6721', '2607', '4333', 'w', 'j', 'l', 'i', 'p', 'z', 'b', '5885', '1227', 'v', '2387', '8567', 'p', '8355', 'k', '9863', '4203', 'y', 'r']
Example Output:
b, h, i, j, k, l, m, p, r, v, w, y, z