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]: ['4123', '1397', '103', 'w', 't', 'j', '233', '7239', 'b', 'n', 't', '6273', 'l', '1167', '8389', '5609', '9029', '7741', 'o', 'p', '6547', '5593', 'd', '8401', 's', '4243', 's', 'u', 'm', '6659', '5691', '2105', '8897']
[EX A]: b, d, j, l, m, n, o, p, s, t, u, w

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

[EX Q]: ['l', 'd', '3845', '2565', '4595', '7949', 'p', '7949', '9821', '9399', 'n', 'w', '323', 'c', '9597', 's', '471', 'r', '7219', 'x', 'q', 'y', '9431', 'm', 'e', 'i', 'n', '9935', '6533']
[EX A]:
c, d, e, i, l, m, n, p, q, r, s, w, x, y