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: ['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']

Output: h, p, r, u, z


Input: Consider Input: ['7911', 'c', 'q', '6297', 'o', '4803', 'u', '6167', '7727', '449', 'o', 'o', 'n', '5147', 'e', '4673', '8805', 'y', 'l', 'g', '1717', 'i']


Output: c, e, g, i, l, n, o, q, u, y