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: ['8129', 'a', '4245', 'y', 'm', 'a']
Example solution: a, m, y
Example explanation: Here, the unique alphabets in the list are 'a', 'y', and 'm', hence their sorted order is 'a, m, y'.

Problem: ['e', '679', '5095', '8111', '8593', 'n', 'e', 'u', 'f', 'h', '7069', '9405', 'g', 'm', 'o', 'w', 'w', '7105', 'f', '1969', '1391', 'i', 's', 'l', 'y', '8059', 'r', '3193', 'q', '2493', '367', '6585', '1577', 'x', 'p', '6569', '6591', 'e', 'm', '2941', 'b', '7013', 'o']

Solution: b, e, f, g, h, i, l, m, n, o, p, q, r, s, u, w, x, y