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: ['g', 'u', 'q', '1375', '9491', 't', 'w', 'c', 'v', 'y', '3169', '1607']

Output: c, g, q, t, u, v, 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: ['6755', '6271', '7985', '1727', '7219', '5835', 'f', '9733', '1961', 'x', '9167', '8005', '3621', 'i', 'w', 'j', 'u', 'n', 'w', 'f', 'x', 'd', '7013', '3451', 'b', '6663', 'a', '4373']


Output: a, b, d, f, i, j, n, u, w, x