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.

['e', 'z', '5199', 'x']
e, x, z

['x', 'o', '8161', 's', '3653', 'v', 'c', 'e', '5353', 'h', '9145', '333', 's', '7689', '8277', 'a', 'o', 'h', 'z', 'w', '9297', 'w', '9383', '8963', 'k', 'x', 's', 'w', 'h', 'j', '5737', 'o', '2247', '3723', '2043', '4615']
a, c, e, h, j, k, o, s, v, w, x, z

['z', 'j', 'g', '7491', '2775', 'k', '7685', '2223', 'z', 'l', '3117', '3591', 'y', 'g', 'v', 'r', 'h', '77', 'h', 'd', 't', '6873', '943', 'd', '6939', 'h', 'i', '619', 'r', 'p', '4751', '6789', '1155', 'u', '393', 'g', 'o', 'r', 'p', '3443', 't', 'b']

b, d, g, h, i, j, k, l, o, p, r, t, u, v, y, z