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.

[Q]: ['o', '4169', 'k', '7349', 'w', 't', '8271', '8781', '3725', '2865', '6053', 'j', 'z', '4211', '8231', '213', '6389', 'f', 'h', 'g', '9269', '4617', '4137', 'i', 'y', 'i', 'n', '4597', 'p', 'z', '3195', '3231', 'c', '1901', '1231', 'p', '4509', '2557', '3715']
[A]: c, f, g, h, i, j, k, n, o, p, t, w, y, z


[Q]: ['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']
[A]: a, e, f, j, l, m, n, r, s, t, w, y


[Q]: ['6813', '9367', 'n', 'v', 'n', '3969', '9723', 'e', '6791', 'v', '6711', 'p', '8717', 'a', 'p', 'f', '9507', '5109', '8353', '5483', 'n', '3661', 'r', 'a', 't', 'f', '865', '2921', '7613', 'b', '7549', '3787', 'h', 'e', 'v']
[A]:
a, b, e, f, h, n, p, r, t, v