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]: ['6655', '7445', '1795', '7495', 'h', 'z', 'u', '2199', 'r', 'p', '2245']
[A]: h, p, r, u, z


[Q]: ['895', '2049', '8839', '1773', 'v', '467']
[A]: v


[Q]: ['1383', 's', '417', '3359', '5371', 'o', 'u', '5283', '8249', 'z', 'r', 'i', '9187']
[A]:
i, o, r, s, u, z