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: ['7187', '7081', 'j', 'i', '3725', '6333', 'h', 'f', '6639', 'r', 'n', '3559', '2785']

Output: f, h, i, j, n, r


Input: Consider Input: ['a', 'y', '7401', 'e', 'l', '4351', 'p', '5673', 'k', '333', 'o', 'd', 'e', 'j', 'e', '9569', '1795', 'r', 'z', '6059', '4399', '2927', 'n', '9387', '9317', 'b', 'c', 'e']

Output: a, b, c, d, e, j, k, l, n, o, p, r, y, z


Input: Consider Input: ['g', '9697', '1167', '2017', 'v', 'f', '5137', '539', 'i', '5637', 'w', 'j', '2701', 'e', '1169', 'y', 'i', 'n', 'm', 'k', '4265', '1989', '9109', 'r', '7485', 'd', '6563', '8611', '4483', '7079', '6521', '7881', 'z', '5511', '1225', 'c', 'h']


Output: c, d, e, f, g, h, i, j, k, m, n, r, v, w, y, z