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]: ['o', '369', 'z', '5721', 'w', 'v', '4973', '7773', 'k', '3071', '5103', '425', '4239', '7977', 'n', 'i', 'k', '8117', '9843', 'n', 'd', '1353', 'h', 'd', 'v', 'z', 'j', '8727', '6997', 'x', '767', '4331', 't']
[EX A]: d, h, i, j, k, n, o, t, v, w, x, z

[EX Q]: ['u', '635', '5249', '9457', 's', '9317', '9407', 'l', 'w', '9705', 'k', '429', '5489', 'e', 'd', '2457', 'o', '4665', '1675', 'l', 'y', 's', 'o', 't', '4285']
[EX A]: d, e, k, l, o, s, t, u, w, y

[EX Q]: ['x', 't', 'i', '3145', 'x', '9685', 'f', '6899', '1119', '7297', 'j', 'f', '2681', 'z', '633', '1291', '3719', '6705', 'f', '9731', '2413', 'v', '3603', '763', '4551', 'l']
[EX A]:
f, i, j, l, t, v, x, z