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: ['d', 'r', '7769', '2159', 's', '3269', '5527', 'l', 'z', 'e', '5165', 'x', 'x', '8273', 'g', 'm', '7609', '4015', '6403', '3753', 'y', 'h', 'l', 'i', '389', 'm', 'u', '6845', 'r', 'c', '7571', '3355', '9755', 'n', '4625', 'p', '5645', '1703', '4439', 't', '8431']
Example Output: c, d, e, g, h, i, l, m, n, p, r, s, t, u, x, y, z

Example Input: ['g', 'p', '2925', 'n', 'o', 'y', '6381', 'l', '4963', 'g', 'm', 'u', 't', '9389', '3787', '7713', '1251', '779', 'i', 'w', '9869', 'y', 'y', '3881', 'k', 't']
Example Output: g, i, k, l, m, n, o, p, t, u, w, y

Example Input: ['w', '6899', 'g', '9921', 'b', '3579', '5269', 'e', 'q', 'x', 'f', '1931', 'c', 'x', 'j']
Example Output:
b, c, e, f, g, j, q, w, x