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]: ['f', 't', '2135', '8397', '6361', '389', '2253', 'x', 'p', '4833', '5785', 'x', '1811', '9639', '5739', '175', '3231', '5931', 'r', 'c', 'g', 'h', 'p', '909', 'p', '587', 'a', 'a', 'h', 'q', 's', '5945', '4911', 't', 'h', '7517', 'p', '3177', 'h', 'u', '3577', '7055', 'l']
[A]: a, c, f, g, h, l, p, q, r, s, t, u, x


[Q]: ['3191', '2655', '239', '2585', '3369', '7815', '5919', '8269', '5633', 'x', '8085', '2909', 'y', '2465', 'i', '1579', 'u', '2371', 'l', '1949', '51', 'e']
[A]: e, i, l, u, x, y


[Q]: ['g', 'c', 'w', '4189', 'z', 'a', '1769', 'r', '4097', 't', 'd', '8561', '4513', 'r', '3305', '3135', 'o', 'e', '8945', '5915', 'h', '1893', 'v', 'b', 'i', 'r', 'n', '7351', '8393', '4947', '4019', 'd', '6953', 'k', '2429', 'v']
[A]:
a, b, c, d, e, g, h, i, k, n, o, r, t, v, w, z