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]: ['9271', '6393', '6005', 'x', '2301', '3999', 'p', 'z', 'j', '1033', '7555', 'r', 'r', 'y', '8917', '5939', '4031', 'e', '8095', 'g', '6095', 'a', '4133', '6471', '2129', '8021', '1093', 't', '8805', '545', 'k', '3249', 'l', '1561', '9909', 's', '1963', 'o']
[A]: a, e, g, j, k, l, o, p, r, s, t, x, y, z


[Q]: ['o', 'h', 'z', 'n', 'e', 'y', 't', '4371', 'm', '1059', '4853', '8529', 'l']
[A]: e, h, l, m, n, o, t, y, z


[Q]: ['w', '3055', '7621', 'j', 's', '5629', '6793', 'g', '3685', 'v', '1203', '1529', 'm', 'e', 'l', '8539', 'g', 'k', '3377', '3561', 'j', '3813', '7805', 'p', 'z', 'j', '1585', '4281', '9735', 'b', 'h', '1513', '9091', 'h', '3727', '2705', '7373', 'b']
[A]:
b, e, g, h, j, k, l, m, p, s, v, w, z