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.

Example Input: ['7071', 'h', '837', 'z', 'c', '2217', 'c', '6341', '6607', 'g', '3569', 'a', 'h', 't', 'b', 'f', 'g', 'f', 'l', 'b', 'x', 'o', 'r', '8949', '8071', '1507', 'v']
Example Output: a, b, c, f, g, h, l, o, r, t, v, x, z

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

Example Input: ['e', '5077', 'f', '5229', '1411', 'o', 'q', '1783', 'o', 'r', 'x', '1665', '2863', '231', 'r', 'k', '3403', '3185', 'i', '7575', '2417', '7803', 'q', '4185', '6431', 'p', 'i', 'f', 'q', 't', 'y', '9285']
Example Output:
e, f, i, k, o, p, q, r, t, x, y