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: ['d', '2359', '6571', 'c', 'n', 'u', '9513', '9321', '1689', 'b', '969', '1823', 'e', 'b', '9147', 's', '1811', 'k', '5443', '8699', '5483', 'v', 'w', 'n', '1215']
Example Output: b, c, d, e, k, n, s, u, v, w

Example Input: ['j', '6675', 'u', 's', '705', '8227', 'f', 'w', 'n']
Example Output: f, j, n, s, u, w

Example Input: ['8579', '5333', '8735', 'y', 'o', 'l', 's', '501', '2157', '8531', '3775', '1531', 't', '8303', '5927', '5547', '3257', 't', '3193', '721', '869', 't', '5655', 'f', 'x', '8375', 'u', 'm', 'g', '8795', '6377', 'y']
Example Output:
f, g, l, m, o, s, t, u, x, y