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.

['e', 'z', '5199', 'x']
e, x, z

['f', '217', '449', 't', 'j', '4097', '5561', '8317', '647', 'u', 'b', '7833', 'r', '9011', 'z', '2753', '2183', 'z', 'o', 'g', '7541', 'b', '8795', '327', 'v', 'e', 't', 'l', '4909', 'k', '7681', 'r']
b, e, f, g, j, k, l, o, r, t, u, v, z

['1419', 'k', '2009', '2415', '5797', '3897', 'o', 'h', '9311', 'n', '7761', 'n', '8237', '1763', '3037', 'g', 'v', 'z', '6943', 'u', 'z', '9561', 'p', 'g', '9205', '4481', '6031', 'k', '2089', '877', '3903', 'g']

g, h, k, n, o, p, u, v, z