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.

Input: Consider Input: ['9025', '3259', '4863', 'u', '6443', '9931', '627', 'x']

Output: u, x


Input: Consider Input: ['z', 'l', 's', 'f', 'j', 'x', '1125', 'd', '37', '5009', '9187', 'b', '8683', '8841', 'y', '9955', '1571', 'm', '347', '3679', '5797', '2133', 'g', 'u', '9817', '6347', '2067', '1927', '167', '4215', '45', 't', 'd', '6599', '4751', 'g', 'l', 'u', '7881', 's']

Output: b, d, f, g, j, l, m, s, t, u, x, y, z


Input: Consider Input: ['b', '4103', '2225', 'h', 'h', '5651']


Output: b, h