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: ['w', 'n', '729', '2491', 'n', 'x', '915', '1869', 'z', '8491', '9947', '561', '829', 'n', 't', 'i']
Example Output: i, n, t, w, x, z

Example Input: ['f', '7573', '2067', 'n', '3671', '7969', '7889', '4893', '6501', 'l', 'y', '4331', 'a', 'e', '2081', '3863', 't', 'j', '7921', 's', '7203', '7797', 'f', '4279', '1299', '987', '5003', '9071', '9559', '6061', '1889', '2653', 'm', 'w', '665', '7343', '9763', 'r', '6343', '9393', '9289']
Example Output: a, e, f, j, l, m, n, r, s, t, w, y

Example Input: ['d', '7963', 't', '9225', 'j', 'f', 'v', '633', 'n', 'o', '35', 'i', 'p', 't', '521', 't', 'r', 'b', '4457', 'b', 'j', '1787', 'f', '1317']
Example Output:
b, d, f, i, j, n, o, p, r, t, v