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]: ['2381', '2865', '4821', 'n', 'u', 's', 'p', 'v', 'v', 'n', '1349', '7903', 'm', '193', 't', 'p', 'c', '3521', 'a', 't', '8281', 'i', '151', '4783', 'm', '3387', '9551', 'z', 'q', 'v', '4549', '4411', 'u', '8735', '2645', '359', '2871', '5923', '5071', 'c', '9843', 'i']
[A]: a, c, i, m, n, p, q, s, t, u, v, z


[Q]: ['g', '6867', '7965', '3313', 'k', '1827', '7337', 'u', '1209', '5145', 'w', 'h', '9059', 'u', 'b', '3189', '2837', 'k', 'y', 'e', 'b', '4479', '541', '7103', 'h', 'm', '2177', '6377', '3993', '7167', 'q', '2145', '5007', '9135', '5331', 'e']
[A]: b, e, g, h, k, m, q, u, w, y


[Q]: ['9527', 'y', '1571', 'h', '3867', '9921', '8647', 'l', 'a', 'i', 'l', '2535', '8047', 'l', 'g', '8851', 'w', 'u', '5189', '6495', 'c', '441', '1531', 'y', '3857', '8405', 'u', 'b']
[A]:
a, b, c, g, h, i, l, u, w, y