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: ['2527', '9123', '8717']
Example Output: -1

Example Input: ['2313', '2073', 'd', 'e', 'o', '793', '4999', 'f', 'c', '4473', '4519', 'u', 'n', 'k', '69', '475', 'a', 'j', 'q', 'x', '5869', '9523', 'z', 'v', '9265', '5989', 'p', 'm', 'g', 'y', 'b']
Example Output: a, b, c, d, e, f, g, j, k, m, n, o, p, q, u, v, x, y, z

Example Input: ['9043', 'r', 'n', '9269', 'o', '4101', 'm', 'l', 'u', 'z', '1717', '6735', '4853', '5723', 'b', '9375', 'm', 'x', '4783', 'c', '4881', '9015', 'x', 'j', 'q', 'q', '8241', '1141']
Example Output:
b, c, j, l, m, n, o, q, r, u, x, z