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.

[EX Q]: ['6737', 'g', '9985', '5257', 'k', 't', '7863', 'y', '8319', 'l', 'o', '6505', '6531', 'z', '3055', '2943', '3625', 'h', '4867']
[EX A]: g, h, k, l, o, t, y, z

[EX Q]: ['j', 's', 'z', 'v', '5401', 'u', '8859', 'i', 'l', 'a', 'p', 'v', 'v', 'o', '3969', '4091', 'y', '6827', '1799', '5163', 'd', 'w', '4795', '5167', 'x', 'q', '2903', '1171', '5279', '449', '7901', 'u']
[EX A]: a, d, i, j, l, o, p, q, s, u, v, w, x, y, z

[EX Q]: ['x', '1509', '3773', '4265', '1973', '6083', 'i', 'q', '3265', '1349', '2091', 'a', '605', 'v', 'p', 'w', 'o', 'z', '3149', 'l', '5739', '7261', '7283', '2325', '2075', 'p', '3213', 'h', 'x', 'c', '3971', '7373', '2219']
[EX A]:
a, c, h, i, l, o, p, q, v, w, x, z