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: ['t', 'u', 'y', 'y', 'b', 'x', 'q', '3713', '2679']

Output: b, q, t, u, x, y


Input: Consider Input: ['7055', '2573', '1713', 'x', 'm']

Output: m, x


Input: Consider Input: ['a', 'h', '2877', 'u', '6063', 'r', 'f', '6623', '5957', '731', 'i', 's', 's', '2111', '5767', 'm', '3795', 'm', '4953', 'r', 'o']


Output: a, f, h, i, m, o, r, s, u