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: ['f', '165', 'm', '9975', '9259', '6505', 'a', 'g', 's', '1127', 'h', 'n', 'c', '6475', 'c', '8657', 'a', '4057', 'm', 'y', 'w', 'm', '6567', '7297', '285']
Example Output: a, c, f, g, h, m, n, s, w, y

Example Input: ['7123', 'm', 'h', '4065', 'c', 'n', '187', '3899', 'r', 'k', '2071', '9481', '6277']
Example Output: c, h, k, m, n, r

Example Input: ['v', 'a', '1703', '1027', 'p', '7895', 'c', 'w', 'n', '6095', 'p', 'h', 'e', 'e', 'y', '8949', '8079', 'x', '277', '539', 't', 't', '7495', 'k', '7301', 'i', 'n', '3941', 'h', '6859', '6253', 'r', '3145', '9189', 'p', 'r', '7093', '2533', 'o', 'z', '8409', '627', '2571']
Example Output:
a, c, e, h, i, k, n, o, p, r, t, v, w, x, y, z