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: ['4945', 'i', 'h', 's', '8925', 'i', '3995', 'f', '813', '1823', '3475', 'q', '2463', '9487', 'c', 'c', 'n', 'y', 's', '6269', 'a', 'u', 'd', 'd', '9291', '3187', '545', '7929', 'd', '1007', '7579', '8421', '4033', 'v', 'c', 'e', 'n', 'j']
Example Output: a, c, d, e, f, h, i, j, n, q, s, u, v, y

Example Input: ['9579', 'm', 'v', 'r']
Example Output: m, r, v

Example Input: ['k', 'p', 't', 'i', 'i', 'e', '7507', '747', 'b', 'o', 'z', '9143', 'r', 'p', 'k', '3235', '5491', '9555']
Example Output:
b, e, i, k, o, p, r, t, z