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]: ['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']
[A]: b, e, f, g, j, k, l, o, r, t, u, v, z


[Q]: ['j', 'r', 'z', 'f', '1485', '2419', 't', 'd', '6023']
[A]: d, f, j, r, t, z


[Q]: ['p', '5675', 'm', '2121', 'd', '4541', '7477', '8021', 'b', '2035', 'c']
[A]:
b, c, d, m, p