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]: ['k', '6595', '1595', 'v', 'h', 'b', '8815', '6681', 'j', '7581', 'p', '9095', '5453', 'r', 'y', '7755', 'x', '1853', 'k', 'q', 'u', 'j', 'q', '9651', 'o']
[A]: b, h, j, k, o, p, q, r, u, v, x, y


[Q]: ['2521', '8027', 'm', '193', '615', 'l', '1947', '5949', '6307', 'r', '1015', '743', 'v', '6949', 'b', 'g', '8841', 'c', 'b', '2879']
[A]: b, c, g, l, m, r, v


[Q]: ['6697', 'w', 'g', '6965', '4123', '3567', 'q', '9469', '2735', 's', 'c', 'p', '2577', '7719', '8257', 'n', 'd', '8213', 'c', '145', '4035', '8737', 's', 'l', 'y', 'z', '1423', 'v', '5855', '3493', 'l', '4569', '5871', 's', '6731', '1617', 'c', 'w']
[A]:
c, d, g, l, n, p, q, s, v, w, y, z