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: ['8301', 'd', 'p', 'l', 'm', '9099', 'o', '8045', 'e', 's', 't', '8853', 'v', '6375', 'q', '2505', 's', '4219', '3587', 'g', '651', '7129']

Output: d, e, g, l, m, o, p, q, s, t, v


Input: Consider Input: ['k', '3277', 'e', '2703', 'j', '4685', 'p']


Output: e, j, k, p