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.

['8357', 'x', 'w', '287', 'z', '2733', '1757', 'w', 'g', '1393', '7201', '4931', 'k', '5185', 'x', '6313', '2255', 'z', 'v', '3593', '6191', '4423', 'm', 'k', '3209', '3559', 'c', 'n', 'm', '5461', '2997', '235', '4045', '6597', 'v', 'e', 'p', 'c', 'k', 'd', '5529', '6241', 'u', 'f', '8067']
c, d, e, f, g, k, m, n, p, u, v, w, x, z

['5337', '4877', '9443', '3445', 'u', '2571', 't', 'n', 'x', '1985', '5145', '3397', 'p', '9259', 's', 'x', 'u', 'c', 'g', 't', 'j', '829', '8273', 'e', 'j', 'r', 'x', '865', '4773', 'h', '4407', '8591']
c, e, g, h, j, n, p, r, s, t, u, x

['u', 'e', '2399', 'm', '6361', '1111', '3525', 'q', '4329', '6261', '5799', 'u', '3079', '4057', '9675', 'n', '8477', '6923', '2213', 'h', '3865', '9469', '739', '5987', '1557', '873', '327', '2661', 'r', '323', 'q', '2331', '5103', '4875', 'h', 'q', 'x']

e, h, m, n, q, r, u, x