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: ['277', '8697', 'q', '2023', '5723', 'm', '8673', 'f', 'z', 'z', 'a', '9875', 'p', 'x', 'l', 'z', 'x', '619', '6509', 's', '2067', '571', 't']
Example Output: a, f, l, m, p, q, s, t, x, z

Example Input: ['c', '4881', '6893', '3729', 'j', '2385', 'q', 'v']
Example Output: c, j, q, v

Example Input: ['o', 'e', 't', '6139', 'e', '8169', '3153', '117', '5659', 'm', 'm', 'y', 'c', '7501', 'k', 'j', '7419', 'i', '3767', '5915', 'd', 'd', '6819']
Example Output:
c, d, e, i, j, k, m, o, t, y