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]: ['1223', 'h', 'a', 'o', 'v', '2535', 'g', '6267', 'w', '9625', '7961', '9577', '7611', '5655', 'p', 'j', 's', '2141', '4101', 'l', '4367', '9383', 'n', '5965', '9097', '7571', 'p', 'u', 'x']
[EX A]: a, g, h, j, l, n, o, p, s, u, v, w, x

[EX Q]: ['895', '2049', '8839', '1773', 'v', '467']
[EX A]: v

[EX Q]: ['z', '7347', 'x', '7333', '2055', '5675', 'n', '4207', '7547', 'g', 'f', 'g', '1199', '4263', '8047', '801', '5727', '5135', 'x', 'a', 't', 't', 'm', 'y', '3981', 'g', 'n', '1895', '4433', '7871', 'k', 'a', '5363', 'f', '3081']
[EX A]:
a, f, g, k, m, n, t, x, y, z