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: ['8879', 'x', '1383', '4925', '2867', 'j', 't', 'e', 'w', 'p', 't', 'w', 'l', '7447', '1877', '7747', 'k', 'b', 'x', '8565', 'q', '8575', '5711', '2949', '5637', '2197', '4905']
Example Output: b, e, j, k, l, p, q, t, w, x

Example Input: ['2161', '8009', '3057', 'r', '3897', 'd', 'j', '2727', 'b', '3231', 'i', '9227', '393', '5799']
Example Output: b, d, i, j, r

Example Input: ['f', 'p', 'g', 'c', '7685', 'l', '1487', 'w', 'g', '315', '5415', '6321', 'b', '5429', '7623', '9577', 'x', 'm', 'j', 'w', '1451', 'r', '9997', 'f', '7859', '5237', '6057', '3757', '133', '8727', 'e', '1023', 'j', '4903', '715', 't', '67', 'd', '201', '8989', 'b']
Example Output:
b, c, d, e, f, g, j, l, m, p, r, t, w, x