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: ['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']
Example Output: c, i, j, k, m, n, o, q, r, s, t, u, x, y, z

Example Input: ['7677', '4069', 'b', 'w', '4381', 'b', '5757', '711', '765', '8347', '6547', '9527', '945', '5333']
Example Output: b, w

Example Input: ['p', 'm', '1147', 'h', 'b', 'n', '1825', '1047', '6803', 'z', 'u', '3125', '9117', '1057', 'c', 'd', '4803', 't', '1035', 'f', 'u', 'g', 'n', 'k', '1363', 'r', 's']
Example Output:
b, c, d, f, g, h, k, m, n, p, r, s, t, u, z