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]: ['8051', 'h', 'g', 's', 't', 'p', 'w', 'x', 's', '8521', 'm', '9719', 'j', 'n', 'i']
[A]: g, h, i, j, m, n, p, s, t, w, x


[Q]: ['c', '9125', '6049', '5201', 'v', '9311', 'q', '3305', 'l', 'q', '3387', '3647', 'x', '471', 'a', '5631', 't', '9679', '5423', '2569', 'w', 't', '6397', 'e', 'h', 'c', 'v', 'v']
[A]: a, c, e, h, l, q, t, v, w, x


[Q]: ['n', '2191', 'd', '2003', '5135', 'm', '7503', '465', '9155', '3933', '4441', '4131', '5613', 'h', 's', '1993', '2201', '9381', 'v', 'l', '817', 'i', 'v', 'c', 'x']
[A]:
c, d, h, i, l, m, n, s, v, x