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: ['v', 'l', 'v', '7673', '8975', 'u', '2471', '4151', '3615', '1139', 'i', 'z', '8833', 'v', '341', 'l', 'n', 'l', 'd', '9207', '1861', '3901', 'a']
Example Output: a, d, i, l, n, u, v, z

Example Input: ['163', 'x', 'g', '5997', 'm', 'l', '7225', '7907', '375', 'y', 'a', 'j', 'c', 'j', '7755', '147', 'h', '3845', 'y', 's', 'h', 'u', '8737', '6091', 'j', 'f', 'c', '7395', '881', '1771', 'y', '3691', 'h']
Example Output: a, c, f, g, h, j, l, m, s, u, x, y

Example Input: ['i', 'w', 'r', 'w', '2519', '6737', '7217', '8717', 'v', '7005', '1701', '5413', '8733', 'g', 'a', 'b', 'g']
Example Output:
a, b, g, i, r, v, w