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.

['w', 'a', 'm', 'd', '409', 'm', 'v', 's', '7801', 'l', '8551', 'k', '867', 'n', '7731', 'z', '3773', '9137', 'v', 's', 'p', 'p', 'f', 'z', 'g', 'q', 'g', '877', '697', '2057', '8389', '2399', '5263', '2761', '9841', '1781', 'l', '8023']
a, d, f, g, k, l, m, n, p, q, s, v, w, z

['7441', '7967', '2011', '1383', 'i', '3623', 'b', 'y', 'e', '1593', 'r', 'a', 'd', 'b', '6159', '3931', '989', '435', 'o', 'y', 'j', 'w', '7669', 'y', '5781', 'u', '531', '7467', '3971', '8139', 'w', 'a', '5113', '9461', '8377', '7431', '6975', '6055', '7307', 'v']
a, b, d, e, i, j, o, r, u, v, w, y

['s', '6139', '7869', '7743', 'l', '117', '5889', 'x', 'y', '9807', '5459', '9517', '9031', 'r', '2659', 'z', 't', 'w', '5313', 'h', '7557', 'r', '6453', '1481', 'h', '8163', '2185', '8925', '2515', '6373', 's', 'c', '6183', 'u']

c, h, l, r, s, t, u, w, x, y, z