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


[Q]: ['1627', 'r', '2429', 'b', '4451', 's', 'k', 'm', '269', 'l', '709', 's', 'q', '985', 'x', 'j', 'k', 'k', '6603', 'v', '9497', '477', '5803', 'c', 't', 'f', '3189', '6419', '8561', '5709', 'u', 'z', '5717', '9711', 'w', 'y', 'm', 'v']
[A]: b, c, f, j, k, l, m, q, r, s, t, u, v, w, x, y, z


[Q]: ['1509', '1137', 'u', '137', '1855', 'v', '9245', 'x']
[A]:
u, v, x