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]: ['d', 'a', '6931', 'c', 'u', 'z', '9713', 'v', 'm', 'e', 'k', 'o', '9705', 'a', '5373', 'c', '2983', '8097', 'h', '3039', 'g', 'f', 'n', 'v', '853', '8227', '7573', 'j', 'h', 'k', 'o', 'k', '8897', 'd', 'g', 'd', 'd', '4039']
[A]: a, c, d, e, f, g, h, j, k, m, n, o, u, v, z


[Q]: ['r', 'j', '437', 'b', '5223', 'n', 'v', '437', 'd', '8285', 'k', 'j', 'r', 'p', 'n', 'e', 'n', 'j', 'o', '2651', 'j', '6365', 'q', 'q', '2159', 'g', '3641', '7727', 'c', '1197', 's', 't', 'n']
[A]: b, c, d, e, g, j, k, n, o, p, q, r, s, t, v


[Q]: ['111', '6487', 'd', '5251', 'p', 'z', 'm', 'z', '6625', '7791', 'e', 'n', '1853', 't', '2571', '3163', '8539', '5729', '7331', 'g', 'n', '5415', 'r', '6005', 'j', 'h', 'h', '739', 'n', '7743', 'g', 'e', 'd', '429', '7477', 'k', '4253', 'g', '1753', 'j']
[A]:
d, e, g, h, j, k, m, n, p, r, t, z