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]: ['4925', '9943', '7935', '4387', '2449', '5797', 'i', '1517', 'w', 'e', '9525', 'y', 't', 'e', '2793', 'v', '9897', '8709', '7247', 'o', 'f', '5549', 'q']
[EX A]: e, f, i, o, q, t, v, w, y

[EX Q]: ['8815', 'w', '8629', 'y', '3891']
[EX A]: w, y

[EX Q]: ['6679', '9703', '3831', 'v', '1981', 'z', 'q', 'o', '8963', '3235', '1407', 'j', '9409', 'w', 'c', '8393', 's', '3647', 't', '3603', 'g', '1135', '7775', 'u', 'n', '4113', 'e', 'w', 'z', 'e', '4131', '8985', 'g', '8585', '1289']
[EX A]:
c, e, g, j, n, o, q, s, t, u, v, w, z