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: ['653', '1969', '6235', '6283', 'd', 'e', '465', 'e']

Output: d, e


Input: Consider Input: ['b', 't', '2199', 'e', 'i', '1883', '5137', '8495', 't', '7377', 'm', '7665', '2009', 'o', '3757', 'm', '861', 'm', 'l', '9229', 'c', 'r', 'q', 'i', 'm', '705', 'b', '4301', 'd', 'l', 'f', '5485', 'h', 'p', '4529', '7879', 'f', 'b', 'm']

Output: b, c, d, e, f, h, i, l, m, o, p, q, r, t


Input: Consider Input: ['v', '5079', '1215', 'u', 'm', 'v', 'a', 's', '1385', 'v', 'y']


Output: a, m, s, u, v, y