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: ['w', '5341', 'b', '6243', 'v', '877', '1087', '6763', '5241', '3369', '9119', 't', 'v', 'j', '8261', 'o', 'b']
Example Output: b, j, o, t, v, w

Example Input: ['575', 'u', 'c', '8113', '2853', '3661', '9427', '3071', '4069', '835', 'w', 't', 'w', 't', 'v', 'g', 'c', '5497', '1703', '8433', 'g', '3545', '2887', 'z', 'a', '2241', '5799', '5915', 'u', '4015', '8327', 'z', 'a', 'w', '8311', '289', '8575', 't', 'b', '2873', 'r', 'z', 'x', '1165', '9881']
Example Output: a, b, c, g, r, t, u, v, w, x, z

Example Input: ['p', 'h', 'w', 'd', '2769', '7563', 'u', 'a', '1925', 'k', '2601', 'r', 'q', 'v', 'z', 'u', 'h', 'q', 'v', '2177', 'q', 'f', 'q', '1491', 'l', 'o', '703', 'r', 'q', '5771', '1059', '3215', '3741', 'c', 'e', '7841', 'g', '1923', '3275', 'l', '1217', 'm', 'q', 'k', 'b']
Example Output:
a, b, c, d, e, f, g, h, k, l, m, o, p, q, r, u, v, w, z