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: ['231', 'r', '5673', 'j', '589', 'z', '4659', 'a', '3763']
Example Output: a, j, r, z

Example Input: ['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
Example Output: c, h, l, u, x

Example Input: ['3445', 'h', 'p', 'v', '8145', '3183', 'w', '901', '5315', '2929', 't', 'a']
Example Output:
a, h, p, t, v, w