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.

[Q]: ['2247', 'w', 'h', '4675', '6153', 'f', '6029', 'o', 'd', 'j', 'z', 'y', 'i', '6899', '3917', 'u', '6447', '6405', 'a', '1705', '8585', 'v', 'f', 'r']
[A]: a, d, f, h, i, j, o, r, u, v, w, y, z


[Q]: ['9925', 'f', '6149', 's', 'd', 's', '75', '8577', '2319', 'b', '3769', '5211', 'q', 'm', '8127', 'f', '3801']
[A]: b, d, f, m, q, s


[Q]: ['a', '7369', '855', '8207', '4799', '7625', 's', 'r', '6303', 't', '1077', 'h', '1765', '4191', '5819', '1207', 'j', '1401', '2415', 'z', 'y', 'v', '9527', '2523', 'n', 'o', 'm', '1565', 'c', '8387', 'u', 'y', 'z', 'l', '9733', 'm', '3251', '9175', 'd']
[A]:
a, c, d, h, j, l, m, n, o, r, s, t, u, v, y, z