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: ['9483', '501', 'j', 'k', '3103']
Example Output: j, k

Example Input: ['j', 'y', '9907', 'a', '5715', 'l', '9817', '1949', '2697', '2255', '9571', '8957', '9329', '6055', 'z', 'q', '1185', '4593']
Example Output: a, j, l, q, y, z

Example Input: ['v', 'h', '5669', 'k', '7043', '3329', '7205', '2261', '2593', '5901', 'o', '5961', '2057', 'g', 's', 'f', 'b', '4299', '5459', 'm', '7807', 'n', 'k', '7947', '749', 'p', 'h', 'c', 'j', '7461', '8615', '2397', '7599', '6577', '9473', 'e', '6141', '8585', 'e', 'f']
Example Output:
b, c, e, f, g, h, j, k, m, n, o, p, s, v

