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]: ['v', '5433', 'v', '6749', '7491', 'i', 'm', 'e', '5815', '8423', '833', '7359', 'm', 'i', 'f', 'u', 'p', 'j', 't', '3171', '6165', 'q', 'a', '9475', 'm', 'q', '5995', '8443']
[A]: a, e, f, i, j, m, p, q, t, u, v


[Q]: ['r', 't', '3539', 'z', 't', '6055', 'r', '5787', '8469', 'p', 'h', '9729', 'z', '1637', '5873', 'c', '3597', '4411', 's', 'k', 'q', '6471', '5375', 'e', 'v', 'i', '7425', 'h', '9079', 'd', '1585', '6011', 'x', '5669', '5219', '4951', '4765', '8285', '2811', 'c', '1805', '6463']
[A]: c, d, e, h, i, k, p, q, r, s, t, v, x, z


[Q]: ['v', 'u', 'z', 'w', 'w', 'a', 'v', 'r', 'v', 'r', 'f', 'u', 'n', '7237', '3905', 'w', 'r', '6371', '6233', '6705', '9555', 'q', '9251', '4381', '8821', 'g', 't', '485', '7945', '7131', '7345', 'u']
[A]:
a, f, g, n, q, r, t, u, v, w, z