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.

['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']
d, e, h, i, l, r, w, y, z

['j', 's', 'z', 'v', '5401', 'u', '8859', 'i', 'l', 'a', 'p', 'v', 'v', 'o', '3969', '4091', 'y', '6827', '1799', '5163', 'd', 'w', '4795', '5167', 'x', 'q', '2903', '1171', '5279', '449', '7901', 'u']
a, d, i, j, l, o, p, q, s, u, v, w, x, y, z

['8721', 'o', 'y', 'u', 'c', '7215', 't', 'w', '6445', 'j', '4513', '3929', '1187', '6327', 'w', '5871', 'v', 'e', 's', '6757', '2759', 'q']

c, e, j, o, q, s, t, u, v, w, y