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]: ['t', 'h', '6141', 'g', 'f', 'z', 'n', 'b', 'k', '9059', 'y', 'p', '4289', '2683', 'a', '3267', 'w', 'p', 't', '3623', '7759', 'a', 'o', 'm', '9815', 'q', 'u', '8051', '6871']
[A]: a, b, f, g, h, k, m, n, o, p, q, t, u, w, y, z


[Q]: ['z', 'm', 'n', 'u', '9159', '7931', '5401', '1383', '8195', 't', 'x', 'q', 'r', '2535', 's', 'j', 'c', '8123', '2429', '5581', 'k', 'c', 't', 'i', 'm', 'o', 't', 'q', '4819', 't', '1649', 'r', 'y', 'z', '8813', '7451', '199', 'o', 'x', 's', 's', '6747']
[A]: c, i, j, k, m, n, o, q, r, s, t, u, x, y, z


[Q]: ['665', 'v', 'l', 'h', '6857', '211', '6045', 'b', '7923', '2147', 'n', 'k', '4417', '3433', '4169', '6165', '3645', '2319', 'd', 'n', '5365', 'v', '1973', 'u', 'c', '1967', 'f']
[A]:
b, c, d, f, h, k, l, n, u, v