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.

['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']
a, e, g, j, k, l, o, p, r, s, t, x, y, z

['9403', '9881', '8391', 't', '1793', 'w', 'x', 'y', '6383', 'j', 'r', '5323', 'r', 'l', 'e', 'u', '7193', '2309', '837', 'z', 'w', 'n', '4427', '8269', '6333', 'a', 'p', '1933', '8497', '2665', '1349', '6807', '9009', 'b']
a, b, e, j, l, n, p, r, t, u, w, x, y, z

['5193', 'i', 'q', 'z', '5301', '3849', '3585', '8767', 'o', '8743', '5185', '6075', '4431', '7409', 'b', '2873', 'j', 'g', '1061', '2989', 't', 'v', '4975', 'u', '771', '6307', '7297', '5021', '7653', 'i', '9535', '1591', '3683', '609', 'u', 'f']
b, f, g, i, j, o, q, t, u, v, z