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 Q]: ['l', '7111', 'd', 'e', 'h', 'z', 'x', '5673', 'v', '8255', 'i', 'z', 'c', 'i', '4287', 'q', '9293', '9137', 'p', 'n', 'o', 'n', '7883', '6453', '7355', '8769', 'y', '9153']
[EX A]: c, d, e, h, i, l, n, o, p, q, v, x, y, z

[EX Q]: ['o', 'd', '6495', '5211', '341', 'v', '385', 'v', 'g', 'v', 'l', '7631', '2675', 't']
[EX A]: d, g, l, o, t, v

[EX Q]: ['r', '2721', '9983', '9309', '9737', '5103', '6369', 'j', '6069', '8387', '7207', 'r', '4097', 'q', '6409', '3591', '7805', '2775', 'n', '6217', '2803', '2111', '3589', 'e', '4025', 'w', '4821', '1137', '5763', '7439']
[EX A]:
e, j, n, q, r, w