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: ['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']

Output: d, e, h, i, m, n, v, z


Input: Consider Input: ['x', 'j', '9747', 'i', '2015', '3505', 'q', 'n', 'h', '3011', 'u', '8043', 'j', 'f', 'd', 'a', 'p', '5817', 'l', 'q', '2275', 'n', '7085', '5373', 'l', 'g', 'b', '8043', '3085']

Output: a, b, d, f, g, h, i, j, l, n, p, q, u, x


Input: Consider Input: ['425', 'o', 'd', 'l', '8633', 'b', 'm', 'h', 'i', '2051', '4211', 'k', 'i', 'z', 'g', '4191', '1609', '7653', 'j', '3761', '6843', '957', 'f', '1675', '8027', 't', '2347', 'd', '5061', '1763', '8047', '5219', '985', '8255', 's', 'o', 'g', '5605']


Output: b, d, f, g, h, i, j, k, l, m, o, s, t, z