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.

Ex Input:
['f', '7573', '2067', 'n', '3671', '7969', '7889', '4893', '6501', 'l', 'y', '4331', 'a', 'e', '2081', '3863', 't', 'j', '7921', 's', '7203', '7797', 'f', '4279', '1299', '987', '5003', '9071', '9559', '6061', '1889', '2653', 'm', 'w', '665', '7343', '9763', 'r', '6343', '9393', '9289']

Ex Output:
a, e, f, j, l, m, n, r, s, t, w, y


Ex Input:
['a', 'i', '7725', '2483', 'e', 'j', '5337', 'b', '6835', '8231', 'm', 'v', 'a', '1475', 'n', '5823', 's', 'm', '7313', '2841', '2585', '4673', 'u', '2083', 'z', 'd', 'p', '2117', 'i', '587', 'i', 'a', '2527', '7967', '6567', 'n', '6145', 'r', 'f']

Ex Output:
a, b, d, e, f, i, j, m, n, p, r, s, u, v, z


Ex Input:
['t', '2605', 'i', '5213', '7469', 'p', '8019', 'h', 'o', 's', 'r', '275', 'p', '2931', 'f', '3861', 'z', '5053', 'x', 'z', 'g', '7021', 't', '4747', 'n', '2303', 'w', 't', 'x', '7137', '1475', 'l', 'l', 'e', '4139', 't']

Ex Output:

e, f, g, h, i, l, n, o, p, r, s, t, w, x, z