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: ['x', '4283', 'n', 'b', 'g', 'p', '8305', '7781', '5907', 's', '1305', 'w', '8623', 'o', 'c', 'u', '1839', '2869', '7537', 'y', '2395', '5309', 'e', '4059', 'l', '6647', 'p', '9717', 'y', 'y', '3769', '2527', '2981', '5255', '4063', 'j', '4843', 'j', '9355', 'z']
Example Output: b, c, e, g, j, l, n, o, p, s, u, w, x, y, z

Example Input: ['8829', 'm', '5369', 'q', '5737', '7799', '5705', 'p', 'w', '1983', '4849', 'h', '6771', 'p', 'y', '1071', 'u', '6401', '7723', 'p']
Example Output: h, m, p, q, u, w, y

Example Input: ['9789', 'k', 'w', 'j', '5965', '8869', 'r', 'q', '1779', '679', 'g', 'l', 'f', 'o', 'a', '8339', '7715', '3687', '6967', '1175', '6569', 'd', '5593', 'x', 't', '205', 'b', '4039', 'w', '5993', '4527', '7335', '5601', 'q', 'o', '4725', '7553', '3219', 'e', 'n', '913']
Example Output:
a, b, d, e, f, g, j, k, l, n, o, q, r, t, w, x