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]: ['n', 'g', 'u', '2873', 'k', '4411', 'w', '8179', 'w', 'w', 'f', 'g', 'e', '7837', '3055', 'z', 's', '6037', 'n', '1479', 'c', '5311', 'i', 'w', 'z', '1891', '9663', 'y', 'f', 'h']
[A]: c, e, f, g, h, i, k, n, s, u, w, y, z


[Q]: ['2705', 'n', 'r', '8259', '6839', '3239', 'w', 'z', '2611', '2957', '2303', '6315', '7801', 'c', 'w', 'm', '5049', '6465', '599', 'h', 'q', '7559', 'n', '9917', 'v', 'l', '643', '6415', '3587', 'c', '917', '4435', 'p', 'a', '317']
[A]: a, c, h, l, m, n, p, q, r, v, w, z


[Q]: ['7859', 'm', '8471', 'f', '3771', 'e', '7373', 'd', '819', '5469', '5627', '883', '4105', '3623', 'f', '9047', '6447', '1031', 'a', 'l', '279']
[A]:
a, d, e, f, l, m