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: ['477', '3931', 'g', '5967', 'm', '9845', '1607', 'a', '1749', 'k', 'j', '7945', '9125', 'v', 'n', 's', '5185', '1117', '17', 'x', '4149']

Output: a, g, j, k, m, n, s, v, x


Input: Consider Input: ['9125', '6521', '9097', '3151', 'x', '1993', 'h', 'p', '595', 'd', 'w', '6357', 'e', '8343', '3221', '5949', '2573', 'f', '537', 'l', 'b', '6579', '2267', 'x', 'k', 'c', 'd', 'c', '6711', 'b', 'i', 'j', '2861', '6323', '7789', '1227', 'v', 'i', '1983', '8733', 'z']


Output: b, c, d, e, f, h, i, j, k, l, p, v, w, x, z