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.

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

Example Input: ['4031', 't', 'o', 'c', 'x', '3007', '8329', '6345', '1267', '1017', 'o', 'x', 'l', '4129', 'd', '1987', '487', 'o', 'g', 'j', 'v', 'x', '3983', 'f', 'g', '5759', 'k', 'i', 'o', 'b', 'n', '683', 'j', 'o', 't', '4361', 'u']
Example Output: b, c, d, f, g, i, j, k, l, n, o, t, u, v, x

Example Input: ['m', 'v', 'l', '8393', 'x', 'e', 'd', '6015', 'l', '9197', 'k', '6305', '2685', '6015', '9457', 'w', '4733', '3223', 'r', '7679', '6721', '3213', '6477', 'o', '7329', 'p', '5235', 'x', '7495', '9077', 'p', '3733', 'o', '4325', '7429', '829']
Example Output:
d, e, k, l, m, o, p, r, v, w, x