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]: ['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]: ['5011', 'l', '925', 'e', 'b', '3077', 'm', '4541', '781']
[A]: b, e, l, m


[Q]: ['135', '8437', 'l', '4755', 'f', 'h', 's', '7031', '3525', '3991', '3609', 'i', '8133', 'f', '1279', '2181', 'g', '23', 'h']
[A]:
f, g, h, i, l, s