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]: ['395', '8309', 'v', 'r', 'x', 'j', 'l', 'b', 'c', 'c', '3123', 't', 'a']
[EX A]: a, b, c, j, l, r, t, v, x

[EX Q]: ['2247', 'w', 'h', '4675', '6153', 'f', '6029', 'o', 'd', 'j', 'z', 'y', 'i', '6899', '3917', 'u', '6447', '6405', 'a', '1705', '8585', 'v', 'f', 'r']
[EX A]: a, d, f, h, i, j, o, r, u, v, w, y, z

[EX Q]: ['1147', 'h', 's', '4625', 'g', 'v', '6049', 's', '5121', 'i', '3157', 'k', 'g', '5875', 't', '3863', 'm', 'u', '4273', '6977', 'g', '3203', '5271', '4667', '2563', 'e', '1795', '1615', 'i', '7489', 'v', '8801', 'v', 'i', 'k', '405', 'l', 'w', 'p']
[EX A]:
e, g, h, i, k, l, m, p, s, t, u, v, w