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: ['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']
Example Output: g, h, i, j, m, n, p, s, t, w, x

Example Input: ['5611', 'x', 't', 'p', '5711', '7079', '5251', '429', 'z', 'u', '8721', '9321', '79', 'i', '189', '3605', 'k', '445', 'r', 'k', 'o', '2189', '8521', '8849', '2651', 'm', '4149', '1577', '3085', '5275', '6413', '5265', '6089', 'r', 'f', '5013']
Example Output: f, i, k, m, o, p, r, t, u, x, z

Example Input: ['b', 'u', '1305', '3599', 'r', '5219', 'w', 'g', 'h', 'v', 'l', '4039', 'n', '8887', '9331', '9515', '7161', '6385', 'w', 'o', '5375', '9971', 'v', '7725', '4405', '4817', 'v', '1101', '3495', '2567', '1115', 'w', '2463', 'x', '8783', 'g', 'g', 'r', '3527', '845', '1567', '8631', 'k', 'r']
Example Output:
b, g, h, k, l, n, o, r, u, v, w, x