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: ['1487', '8003', 'd', '7237', 'l', 'y', '2749', 'e', '9685', '2825', 'z', '7743', 'r', '9617', 'w', '4323', '2173', '8419', '2831', '8923', 'l', '2985', '303', 'y', '9409', 'i', 'h', 'e']

Output: d, e, h, i, l, r, w, y, z


Input: Consider Input: ['w', '1349', '3393', '7507', '2469', '8531', 'w', '6845', 'k', 'q', '2401', 'f', 'g', 'l', 'n', 'n', 'e', 'q', 'y', 'v', '3077', '4167', 'b', '5517', 'b']

Output: b, e, f, g, k, l, n, q, v, w, y


Input: Consider Input: ['9347', '7101', '4085', 'v', 'x', 'f', 'e', 'g', 'd', 't', 'i', 'v', '3127', 'v', 'b', '5239', 't', '1963']


Output: b, d, e, f, g, i, t, v, x