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.

Input: Consider Input: ['9923', 'x', '1901', 'v', '1459', '7503', '3829', '4929', 'k', 'c', '3329', '8793', 'n', 'a', '7249', 'b', 'l', 'l', 'm', 'p', 'b', 'a']

Output: a, b, c, k, l, m, n, p, v, x


Input: Consider Input: ['5075', '9169', '4659', '7605']

Output: -1


Input: Consider Input: ['y', '1205', '8601', 't', 'c', '6921', 'l', '2177', 'w', '5563', '667', 'd', '985', '4499', '7635', '9049', '7005', 'y', 'y']


Output: c, d, l, t, w, y