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: ['7073', 'd', 'e']

Output: d, e


Input: Consider Input: ['6233', 'h', 'i', 'j', 'k', '9673', 'v', '8895', '4235', '4329', '6175', '7407', '2085', '6027', '3133', '405', '485', 'c', '1799', '7353', '1913', 'o', '9801', '3303', 'q', 'k', 'd', 'k']


Output: c, d, h, i, j, k, o, q, v