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: ['g', '4165', 'n', 'w', 'n', 'e']

Output: e, g, n, w


Input: Consider Input: ['v', '1865', 'd', '341', 'e', '5463', 't', 'k', '9535', '3575', '1507', '387', '9105', 'w', '6877', '1515', 'f', '5339', 'n', '2791', '5543', 'j', 's', 'g', 'j', '6119']


Output: d, e, f, g, j, k, n, s, t, v, w