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: ['7301', '7999', 'x', 'r', '6881', 'e', '609', 's', '7495', 'a', 's', '1961', 'q', 'x', '373', '6289', '4847', '5969', 't', '5487', '7639', '9039', '2395', 'b', 'd', '1447', 's', '8137', 's', '443', 'f', 'z', '4823', 'k', 'i', 'o', '4739', 'w', 'f', '8853', 'a']
Example Output: a, b, d, e, f, i, k, o, q, r, s, t, w, x, z

Example Input: ['9271', '6393', '6005', 'x', '2301', '3999', 'p', 'z', 'j', '1033', '7555', 'r', 'r', 'y', '8917', '5939', '4031', 'e', '8095', 'g', '6095', 'a', '4133', '6471', '2129', '8021', '1093', 't', '8805', '545', 'k', '3249', 'l', '1561', '9909', 's', '1963', 'o']
Example Output: a, e, g, j, k, l, o, p, r, s, t, x, y, z

Example Input: ['h', 'c', '7547', 'g', '6133', '4877', '8845', '6717', 'j', 'u', '8623', 'j', '7065', 'x', 'c', 'j', 'l', '1177', '93', 'p', '7237', '117', '3311', 'k', '7851', '7383', '3889', 'a']
Example Output:
a, c, g, h, j, k, l, p, u, x