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: ['7155', 'y', '145', '7147', 'u', '8453', 'd', '3693', '6471', '5289', 'n', 'p', '8289', '2929', '199', 'e', '8377', '8937', '5315', 't', 'l', '7715', 'c', 'y', 'f', '9999', 'p', '3655', '5489', 'q', '2321', '9881', '2265', 'n', 'v', '455']

Output: c, d, e, f, l, n, p, q, t, u, v, y


Input: Consider Input: ['v', 'l', 'v', '7673', '8975', 'u', '2471', '4151', '3615', '1139', 'i', 'z', '8833', 'v', '341', 'l', 'n', 'l', 'd', '9207', '1861', '3901', 'a']

Output: a, d, i, l, n, u, v, z


Input: Consider Input: ['3389', '8291', '9593', 'u', '4087', 'c', 'd', 'u', '3157', 'j', 'u', 'x', '7505', '9243', 'v', '8679', 'z', 'v', '9089', 'd']


Output: c, d, j, u, v, x, z