Q: 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.
['i', '1277', '1191', 'j', '1821', '933', 'q', '7485', '1919', 'g', '4985', 'i', '9919', 'q', '2601', 'q', '29', 'i', '5561', 'v', 'z', '2855', '6109', '7751', 't', '5763', 'q', 'm', 'd', '5871', 'a', 'q', '1241', '3823', '6417', '1877', 'z', '5789', '3673', 'z', 't', 'd']
A:
a, d, g, i, j, m, q, t, v, z