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: ['f', '9203', 'w', 'f', '3751', '8095', '1319', 'f', '3017', 'r', 'y', '8221', '2715', '9959']
Example Output: f, r, w, y

Example Input: ['i', '1129', 'f']
Example Output: f, i

Example Input: ['d', '5081', '5203', 'r', '5635', '4477', '1395', 'y', 'f', '6263', 'z', '6289', 'i', 'b', 'w', '6607', 'h', 'g', 's', '2663', 'w', '3705', 'y', '7467', '8415', 'y', '5211', 'z', '4207']
Example Output:
b, d, f, g, h, i, r, s, w, y, z