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]: ['4945', 'i', 'h', 's', '8925', 'i', '3995', 'f', '813', '1823', '3475', 'q', '2463', '9487', 'c', 'c', 'n', 'y', 's', '6269', 'a', 'u', 'd', 'd', '9291', '3187', '545', '7929', 'd', '1007', '7579', '8421', '4033', 'v', 'c', 'e', 'n', 'j']
[A]: a, c, d, e, f, h, i, j, n, q, s, u, v, y


[Q]: ['7799', '8163', '3389', 'x', 'k', 'm', '6085', 'f', '1131']
[A]: f, k, m, x


[Q]: ['a', 'g', '9927', '9969', 'h', '279', '5877', '5891', 'u', 'm', 's', '4391', '1183', '865', '2905', '4787', 'k', 'm', '4703', 'f', '3571', '2559', '6669', 'o', 'v', 'f', 'd', '8103', 'm', 'n']
[A]:
a, d, f, g, h, k, m, n, o, s, u, v