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.

Example Input: ['9223', 'w', '8631', '4453', '9975', 'y', '9747', 'g', '7077', '2593', '6015', 'n', '7345', 'i', '7807', '299', 'q', '3629', '2545', 'k', 'm', 'q', '5155', '5633', 'x', 'q', 'i', '27', 'f', '7919', 'p', '4835']
Example Output: f, g, i, k, m, n, p, q, w, x, y

Example Input: ['5553', 'f', '3881', '8867', 's', 'd', 'a', '375', '7889', '3949', '2905', 'w', 'q', 'q', 'd', '4203', 'i', '2601', 'y', 'p', 'k']
Example Output: a, d, f, i, k, p, q, s, w, y

Example Input: ['8243', 'x', 'r', 'x', '3947', 'h', 'm', 'l', '2673', 'b', 'j', 'c', 'a', 'o', '5127', '6051', '895', 'i', '3173', 'n', '2107', 'z', '8177', 'y', '8937', 'p', '3335', 's', 'z', '323', '2553', 'f']
Example Output:
a, b, c, f, h, i, j, l, m, n, o, p, r, s, x, y, z