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]: ['2995', '8179', '8131', '5655', 'j', 'q', 'l', '3193', '1823', 'y', 'n', '7645', 's', '5665', 'r']
[EX A]: j, l, n, q, r, s, y

[EX Q]: ['1487', '8003', 'd', '7237', 'l', 'y', '2749', 'e', '9685', '2825', 'z', '7743', 'r', '9617', 'w', '4323', '2173', '8419', '2831', '8923', 'l', '2985', '303', 'y', '9409', 'i', 'h', 'e']
[EX A]: d, e, h, i, l, r, w, y, z

[EX Q]: ['9527', '7451', '5169', '2351', 'l', 'j', '7201', '2335', '4601', '2395', 'u', '1337', '5601', '4773', 'o', 'v', '7651', 'b', '9345', '5117', 'k', 'n', '4983', '1453', '3', 'x', '3429', 'o', 'i']
[EX A]:
b, i, j, k, l, n, o, u, v, x