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]: ['e', '2239', 'l', '8309', 'i', '2613', 'i', '611', '6481', 'j', 'v', '1867', '415', '269', '8053', '3369', 'q', 't', '2303', '7729', '1059', '6135', '3299', 'd', '6855', '207', '6227', '7859']
[A]: d, e, i, j, l, q, t, v


[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]: ['w', '8421', '1071', 't', '7693', 'e', 'n', '3331', 'h', 'u', 'n', 'i', '1359', 'r', 'e', 'z', '1519', 'k', '7521', '7105', '9617', '6443', 'b', '1777', '5671', '9139', '8241']
[A]:
b, e, h, i, k, n, r, t, u, w, z