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: ['2705', 'n', 'r', '8259', '6839', '3239', 'w', 'z', '2611', '2957', '2303', '6315', '7801', 'c', 'w', 'm', '5049', '6465', '599', 'h', 'q', '7559', 'n', '9917', 'v', 'l', '643', '6415', '3587', 'c', '917', '4435', 'p', 'a', '317']
Example Output: a, c, h, l, m, n, p, q, r, v, w, z

Example Input: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']
Example Output: a, g, h, j, l, n, o, p, s, u, v, w, x

Example Input: ['485', 'l', '3293', '2687', 'd', 'q', '3997', 'h', '7593', '2859', 't', '8787', 'i', 'n', '8787', '4569', '7945', 't', 'k', '8463', '6665', 'g', '9011', 'q', '8347', '7371', '8145', 'i', '2597', 'j', '8799', '2849', '3091', '8727', '9755', '5367', 't', '2775', 'k', 'x', '6567', '1593', 'o', '9055', 'i']
Example Output:
d, g, h, i, j, k, l, n, o, q, t, x