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.

[Q]: ['s', 'j', '6779', '1535', 'd', 'e', 'u', '3023', '241', '9115', 'h', '8003', '3755', 'q', 'm', '2725', 'x', 'y', 'n', 'm', 'j']
[A]: d, e, h, j, m, n, q, s, u, x, y


[Q]: ['v', 'd', '3805', '8031', '3327', 'c', 'n', '6153', '2705', 'w', '5675', '6543', 'm', 'v', 'y', 'd', '2943', '4423', '515', '4501', 'y', '9377', 'j', 'i', 'f', '4749', 'o', 'r', '2605', 'm', '117', 'o', '9197', 't', 'l', '4145']
[A]: c, d, f, i, j, l, m, n, o, r, t, v, w, y


[Q]: ['i', '8373', '209', '6421', '3843', 'h', '2567', '151', 'o', 's', '7391', '3899', 'o', '6255', '7007', '8879', 't', '2209', '6091', 'o', '2329', '9331', 'l', '9105', 'l']
[A]:
h, i, l, o, s, t