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 Q]: ['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']
[EX A]: d, e, h, i, m, n, v, z

[EX Q]: ['m', '7517', '9361', '9567', '8785', 'k', '5699', '3585', 'v', '1913', '1651', 'g', 'p', '2731', 'q', 'h', '467', 'r', '1091', '9801', 'a', '6645']
[EX A]: a, g, h, k, m, p, q, r, v

[EX Q]: ['o', '8715', '429', 'l', '479', '5043', 'f', '6531', 'm', 'k', '2041', '4001', '8321', 'o', '2377', '8591', '3521', '1997', '5959', '8815', '6105', 'g']
[EX A]:
f, g, k, l, m, o