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: ['h', 'g', 'j', 'i', 'y', '7799', 'y', 'e', 'y', 'e', '6757', '3349', '1213', '191', 'd', '2149', '849', '8325', 'b', '6087', 'w', '7211', '7801']

Output: b, d, e, g, h, i, j, w, y


Input: Consider Input: ['c', '9125', '6049', '5201', 'v', '9311', 'q', '3305', 'l', 'q', '3387', '3647', 'x', '471', 'a', '5631', 't', '9679', '5423', '2569', 'w', 't', '6397', 'e', 'h', 'c', 'v', 'v']

Output: a, c, e, h, l, q, t, v, w, x


Input: Consider Input: ['x', 'v', '6861', '841', 'x', 'a', 'd', 'f', '4515', '8025', '6643', 'p', 'p', '8615', '431', 'd', 'i', '5323', '97', 'o', 's', 't']


Output: a, d, f, i, o, p, s, t, v, x