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]: ['g', '7517', '3173', 'd', '2143', 'n', '8507', 'l', '8369', '225', 'e', 'l', '9511', 'p', '1317', '5651', 'p', '1125', 't', '739', '6453', 'l', 'g', '8555', '8075', 'x', 's', 'd']
[EX A]: d, e, g, l, n, p, s, t, x

[EX Q]: ['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']
[EX A]: a, e, f, j, l, m, n, r, s, t, w, y

[EX Q]: ['9573', '8607', 'v', '8399', '4371', '7033', 'd', 'b', '1099', 'w', '7869', 'p', '7313', '8415', '2889', 'a', 'n', '5735', '1177', '5839', 'z', 'w', 'c', 'd', 'a', 'n', 'y', 't', '6053', '9301', '8939', '3737', 'k', 'n', '6475', '4155', '4367', 'l', 's', '5347', '7659', 'b']
[EX A]:
a, b, c, d, k, l, n, p, s, t, v, w, y, z