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: ['l', 'u', '3901', '341', '5801']
Example Output: l, u

Example Input: ['5499', 'v', '6507', 'w', 'c', '8431', '8861', '5391', '4765', '4295', '1865', '485', '7255', '1205', 'p', 'w', 'q', '6833', '959', 'a', 'i', '2599', '7779', 'h', '9651', 'g', 'r', 'e', 'u', '4511', '1587', '5601', '8287', '5685', 'u', 'g', '2853', 'p', 'k']
Example Output: a, c, e, g, h, i, k, p, q, r, u, v, w

Example Input: ['a', '6499', '8279', 'd', 'b', '9105', '4049', 'd', 'x']
Example Output:
a, b, d, x