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: ['9467', 'o', '8347', '7125', '7999', '1737', 'h', '7043', '8617', '2033', '9959', '2349', 'p', '9389', '5525', 'w', 'u', 'p', '4703', '9807', 's', 'f', '2359', '7357', '2471', '5447', 'f', 'w', '2865', '6627', '3211', 'y', '23', 'z', 's', '1517', '3553', 'r', '2251']
Example Output: f, h, o, p, r, s, u, w, y, z

Example Input: ['3019', 'g', 'q', 'u', '611', 'z', '3671', '8119', '1679', 'h', '2631', '655', 'k', '2837', 'e', 'f', 'e', 'f']
Example Output: e, f, g, h, k, q, u, z

Example Input: ['4693', 'e', '8199', 'b', 'q', 'i', 'f', '7163', '3431', 'u', '2495', '4183', 'x', '9499', '3203', '8689', 'b', '2371', '9663', '6465', 'p', '2755']
Example Output:
b, e, f, i, p, q, u, x