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: ['v', '3765', '4065', 'a', '4201', 'f', 'x', '9275', 'q', '9303']
Example Output: a, f, q, v, x

Example Input: ['i', '4447', 'g', 'o', 'j', 'p', 'l', 'q', 'o', '8777', 'r', 'v', '961', '6083']
Example Output: g, i, j, l, o, p, q, r, v

Example Input: ['p', '3791', '6033', 'j', 'x', 'j', '4849', 'i', '8683', 'd', '9151', 'g', '3655', 's', '7761', 'h', '5721', 'k', '8319', '1221', '3115', 'w', '2803', '7879', '6389', 'p', 'm', '7007', 'l', '6225', '5807', 'n', 'q', '7749', '4287', 'r', 'x', '427']
Example Output:
d, g, h, i, j, k, l, m, n, p, q, r, s, w, x