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]: ['2453', 'r', 'd', '8499', 't', 's', 'h', 'a', 'm', '9271', 'g', '2599', '6209', 'o', 'i', '4069', 't', '6793', '7679', '6643', '7359', 'm', 'f', 'w', '775', '3347', '6161', '9745', 'i']
[A]: a, d, f, g, h, i, m, o, r, s, t, w


[Q]: ['s', '2507', '3091', 'g', '7643', '2573', 'w', 'r', '1977', 'q', 'c', 'j', '1335', '9671', '7317', '567', '2041', '5777', 'w', 'm']
[A]: c, g, j, m, q, r, s, w


[Q]: ['2721', '6005', 'k', '2033', '1455', 'c', 'b', 'y', 'j', '8515', 'r', '9095', '2147', '1143', 'h', '6115', 'z', 's', '85', 'o', 'z', '1783', 't', '183', 'x', '9791', '3861']
[A]:
b, c, h, j, k, o, r, s, t, x, y, z