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: ['j', '6675', 'u', 's', '705', '8227', 'f', 'w', 'n']
Example Output: f, j, n, s, u, w

Example Input: ['4993', 'n', '7115', 'f', 'd', 'q', '249', '3203', 'w', '5689', '4103', '7129', '603', 'e', 'z', '5571', '3241', '6029', '2721', '8451', 'o', '7841', 'p', '6271', 'r', 'b', '9481', '4045', 'v']
Example Output: b, d, e, f, n, o, p, q, r, v, w, z

Example Input: ['7353', '6909', '999', '8331', '1313', 'q', '8451', 'm', 'y', 'n', '8267', 'o', 'd', 'o', '6791', 'x', 'h', '9773', '1255', 'd', 'p', '7791', '9023', '8963', 'z', '3535', 'o', 'x', '6897', '7549', '7063']
Example Output:
d, h, m, n, o, p, q, x, y, z