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: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']
Example Output: c, d, i, j, k, n, u, v, z

Example Input: ['d', '1989', '6365', 'y', 'm', '1245', '7539', 'm', '3787', '6987', 'e', 'e', 'y', '9577', 'b', '5', '8179', 'x', '2853', '6337', 'w', 'f', 'b', 'q', '563', '6077', '1133', 'x', '6045']
Example Output: b, d, e, f, m, q, w, x, y

Example Input: ['l', 'q', '6593', 'l', 'u', '1685', 'h', '4213', 'd', 'x', 't', '7273', 'i', '9471', 'x', '3557', 'a', '3619', 'b', 'g', 'v', '2875', '4321', 'l', 'f', '5613', '6919', 'r', '2697', 'j', 'f']
Example Output:
a, b, d, f, g, h, i, j, l, q, r, t, u, v, x