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]: ['i', 'i', 'h', 'g', '5123', 'i', 'r', '3183', 'w', 'g', 's', '9777', '455', 'l', 'r', 'h', 'e', 's', 'v', '6823', '463', '9603', 'e', '947', '7071', 'c', '3373', 'j', 'w', 'm', 's', 's', '3483', '9567']
[A]: c, e, g, h, i, j, l, m, r, s, v, w


[Q]: ['p', 'k', 'i', '753', 'u', 'm', '3817', '1597', 'l', 'm', 'a', 'i', 'b', 's', 'c', '2561', 'x', '5363', '1173', '8657', '2033', 'b', 'p', '3093', 'k', '6535', '307', '9925', 'b', 'q', 'q']
[A]: a, b, c, i, k, l, m, p, q, s, u, x


[Q]: ['s', 'm', 'u', '8061', '1971', '2451', 's', '3703', '9797', 'n', '6245', 'x', '6979', 'k', 'x', '3297', '3691', 'w', 'i', 'l', '4391', '8321', 'p', 'q', 'k', '3633', 'e', '9875', 'u', '3905', '9233', 'k', '5027', 'm', 'w', 'e', '1325']
[A]:
e, i, k, l, m, n, p, q, s, u, w, x