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: ['1985', '729', '169', '1299', 'l', 'z', '6809', '3083', 'w', 'f', '1989', 'z', '889', 'x', 'r', '1601']

Output: f, l, r, w, x, z


Input: Consider Input: ['6143', '9073', 'h', '1459', 'q', '5799', '6555', '525', '7921', '5041', '3273', '383', 'd', '9075']

Output: d, h, q


Input: Consider Input: ['9963', 'i', 'l', 's', '5151', '2167', 'k', '5865', 'n', '8423', 'k', 'e', '963', 't', 'm', 'd', 'g', 'g', '8635', '533', '1649', '1251', 'x', '5989', 'h', '6079', '9337', '5841', 'x', 'x', 'q', 'h', '8145', '5561', '7481', 'q', '7747']


Output: d, e, g, h, i, k, l, m, n, q, s, t, x