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]: ['z', '8763', '6399', '45', '6731', 'v', '441', '4763', 'u', '8741', 'r', '9143', 'd', 'p', '2241', 'y', '6523', 'y', 'w', '6771', 't', 'r', '9239', '295', 'z', '461', 'b', '9217', '2597', '1249', 'r', 'i']
[A]: b, d, i, p, r, t, u, v, w, y, z


[Q]: ['b', 'd', '8153', 'u', '3695', '5317']
[A]: b, d, u


[Q]: ['1885', '995', '8317', '7675', 'n', '3083', 'p', 'h', 'l', '4099', '3235', '5029', 'b', '2195', 's', 'e', 'p', 'w', 'x', '859', 'd', '9279', '2313', '5519', '3481', '1065', '5471', '3551', '2119', 't', '489', '8561', '3195', 'o', 'j', '7791', '3463', '3995', 'e', '3883', 'l']
[A]:
b, d, e, h, j, l, n, o, p, s, t, w, x