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: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']
Example Output: c, d, i, j, k, n, u, v, z

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

Example Input: ['o', 'y', 'w', 'e', '1441', '4267', 'i', '5877', 'c', '8939', 'g', 'c', '3171', '1273', 'x', 'u', 'c', '7759', '5741', 'i', 'w', 'i', 'h', '6693', '2625', 'x', 'f']
Example Output:
c, e, f, g, h, i, o, u, w, x, y