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.

Q: ['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']

A: a, c, e, g, h, i, k, p, q, r, u, v, w
****
Q: ['8315', 'b', '4333', 'f', '6507', '6211', '3475', 'c', 'e', '8039', '661']

A: b, c, e, f
****
Q: ['y', '9541', 'w', '4159', 'l', 'g', '1703', '3547', '2845', '6499', '5339', 'g', '9741', '2827', 'v', 'p', 'y', 'j', '1397', '9527', 'e', '6049', 'z', 'x', 'y', 'r', 'p', 'w', '5437', '6053']

A:
e, g, j, l, p, r, v, w, x, y, z
****