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: ['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']

Output: a, b, c, j, l, r, t, v, x


Input: Consider Input: ['a', '7599', 'i', '9455', '3955', '2015', 'j', '7345', 'x', 't', 'c', '1317', '9155', '6383', '7793', 'n', '5581', 'v', '3485', 'n', 'r']

Output: a, c, i, j, n, r, t, v, x


Input: Consider Input: ['8203', 'f', '315', 'i', '9555', 'm', 'n', 'v', '1847', '2451']


Output: f, i, m, n, v