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: ['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']

Output: c, e, g, h, i, j, l, m, r, s, v, w


Input: Consider Input: ['4213', '3595', '7937', 'y', '5723', 'v', 'b', '7007']

Output: b, v, y


Input: Consider Input: ['h', '9675', '2329', 'l', '7553', '8133', 'p', 'm', 's', 'b', '5279', '1311', 'g', '5735', 'm', '2967']


Output: b, g, h, l, m, p, s