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.

Ex Input:
['4269', '1847', '2025', '601', 'g', 'n', 'h', '3499', '4977', '3579', '9355', '3489', 'm', 'm', '4401', '4605', 'l', '3977', 'h', 'd', 't', '5135', '7787', 'k', 'q', '7699', '5325', '6269', '1865', 'h', '8915', '5677', 'g', '603', '1435']

Ex Output:
d, g, h, k, l, m, n, q, t


Ex Input:
['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']

Ex Output:
d, e, i, j, l, q, t, v


Ex Input:
['h', '8431', 'c', 'g', 'c', '8391', '9385', '7529', 't', 'x', '6033', '3579', '6905', '445', 'i', '2707', '4327', '7533', '7381', '1677', '8859', 'a', 'f', 'n', '5127', 'l', '7407', 'f', '5591', 'b', '4109', '6367', 'h', '1045', '7841', '7785', 'v']

Ex Output:

a, b, c, f, g, h, i, l, n, t, v, x