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: ['k', 'v', 'e', '6377', 'y', '3585', '4535', 'f', 'g', 'm', 'f', '8369', 'v', '7445', '4527', '9383', 'n']
Example Output: e, f, g, k, m, n, v, y

Example Input: ['1447', 'q', '9529', '2971', 's', '7351', '6753', '3493', 'v', 'c', 'x', '3097', '9145', 'b', 'e', 'b', '2967', '6933', 'e', 's', 'v', 'f', 'z', 'r']
Example Output: b, c, e, f, q, r, s, v, x, z

Example Input: ['b', '4097', 't', '4559', 'y', 'u', '3257', 'k', 'o', '3213', 'n', '4979', '7187', 's', 'k', 'n']
Example Output:
b, k, n, o, s, t, u, y