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: ['491', '229', 'g', '6677', '4793', 'h', 'x', 'a', '2333', 'u', 'l', '785', 'p', '7331', '653', '5193', '5415', '8417', 'v']
Example Output: a, g, h, l, p, u, v, x

Example Input: ['9923', 'x', '1901', 'v', '1459', '7503', '3829', '4929', 'k', 'c', '3329', '8793', 'n', 'a', '7249', 'b', 'l', 'l', 'm', 'p', 'b', 'a']
Example Output: a, b, c, k, l, m, n, p, v, x

Example Input: ['3673', 'b', 'a', 'n', '9567', 'u', 'a', 'c', 'z', 'i', '8625', 'r', 'z', '4527', '5427', '19', '4075', '8377', 'z', '7625', '3305', 'x', 'q', 'f', '9325', 'i', '3273', '9013', '1819']
Example Output:
a, b, c, f, i, n, q, r, u, x, z