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: ['2775', '7507', 'c', '4417', '3449', 'y', 'z', 'e', 'f', '9515', '8555', '7269', '8353', '4239', '4347', '4479', '8645', '9925', 'o', 'h', 'o', '8641', 'y', '3251', '1191', 't', 'x', 'z', '7203', 'b', 'b', '7545', '7283', 'z', 'y', '8127', 'x', 'l', '6251', 'y']
Example Output: b, c, e, f, h, l, o, t, x, y, z

Example Input: ['8975', '7199']
Example Output: -1

Example Input: ['5819', '8169', 'c', 'x', '8447', 'q', '4941', '703', '4257', '7595', '2137', '9359', 'h', '6153', 'y', 'f', 'k', '7537', '2745', 'q', 'b', '6981', '3725', 'b', '9981', 'b', 'p', 'x', '943', '7569', 'p', 't', '1927', '937', 'g', '4455', 'l']
Example Output:
b, c, f, g, h, k, l, p, q, t, x, y