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]: ['h', 'b', '9601', 'h', 'h', 'h', '8099', '8265', 'i', 'd', '8791', 'p', '8059', '4309', '501', '2581', '9837', '157', '4785', '5925', 'q', '8491', '4779', 'r', 'l', 'k', '3679', 'v', 'g', 'g', '9731', '1909', '9783', 'f', '4293', '5009', 'o', '3057', '3157', 'c', '5587', 'b', 'f', 'd', 'k']
[EX A]: b, c, d, f, g, h, i, k, l, o, p, q, r, v

[EX Q]: ['5163', 'n', 'j', '67', '3801', 'n', '7113', 'z', '579', '6885', '8921', 'v', '5481', '5507', 'k', '8403', 'c', '837', 'u', '6341', 'd', 'i', '497']
[EX A]: c, d, i, j, k, n, u, v, z

[EX Q]: ['k', '6465', '7461', 'q', '8351', 'q', '9793', '5417', '7157', '775', '2591', 'm', 'h', '6961', '4605', 'h', '7313', '8419', '7923', '3135', 'p', '39', 'h', 'a', '4071', 'l', '6599', 'm', '6955', 'b', '5301', 'x', '9223', 'o', 'h', 'b', 'r', 'c', 'u', '9267', '7185', '5681']
[EX A]:
a, b, c, h, k, l, m, o, p, q, r, u, x