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: ['9923', 'x', '1901', 'v', '1459', '7503', '3829', '4929', 'k', 'c', '3329', '8793', 'n', 'a', '7249', 'b', 'l', 'l', 'm', 'p', 'b', 'a']

Output: a, b, c, k, l, m, n, p, v, x

Input: Consider Input: ['4925', '9943', '7935', '4387', '2449', '5797', 'i', '1517', 'w', 'e', '9525', 'y', 't', 'e', '2793', 'v', '9897', '8709', '7247', 'o', 'f', '5549', 'q']

Output: e, f, i, o, q, t, v, w, y

Input: Consider Input: ['4405', '4141', '3691', '4781', '989', '1741', 'o', 'x', 'w', 'e', 'b', '2033', '2187', '6781', '5621', 'f', 'l', '5887', '77', '8893', 'n', 'e', '7885', '4287', '3935', '3243', 'l', 'q', 'j', 'm', 'b', 'x']
Output: b, e, f, j, l, m, n, o, q, w, x