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: ['h', 'g', 'j', 'i', 'y', '7799', 'y', 'e', 'y', 'e', '6757', '3349', '1213', '191', 'd', '2149', '849', '8325', 'b', '6087', 'w', '7211', '7801']

Output: b, d, e, g, h, i, j, w, y


Input: Consider Input: ['u', 'i', '1185', '3795', '5417', 'k', 'b', '2629', '2635', 'z']

Output: b, i, k, u, z


Input: Consider Input: ['d', '4861', '3565', 's']


Output: d, s