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.

Input: Consider Input: ['1593', '8165', 'q', '6689', 'b', 'r', '373', 'g', '6505', '415', '495', 'j', 'j', 'f']

Output: b, f, g, j, q, r


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

Output: h, m, p, q, u, w, y


Input: Consider Input: ['5899', '3679', 'y', 'i', '7149', 'o', '3463', 'b', '3431', 'c', '2813', '6967', 'l', 'x', 'c', '4531', '2937', 'i', '2811']


Output: b, c, i, l, o, x, y