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: ['m', '7807', 'n', 'w', '5097', '1023', '2723', 'u', '3055', '7285', 'f', 'm', 'w', '5197', '9743', '7519', '4451', 'c', 't', '1939', '5847']
Example Output: c, f, m, n, t, u, w

Example Input: ['h', 'v', '1263', 'y', '3299', 'd', 'a', 'h', 's', '2007', '7597', '1015', 'k', '6643', '6959', 'g', 'u', 'd', '5737', 'n', 'z', 'y', 'b', 'g', '9059', '7349', 'j', 'w', 'i', 'z', 'p', '5809', 'x', '4421', 'g', '6399', '3965']
Example Output: a, b, d, g, h, i, j, k, n, p, s, u, v, w, x, y, z

Example Input: ['p', 'x', '8713', 'v', 'p', 'g', '2823', 'q', '2261', 'c', '5807', '3195', 'q', 's', '9139', '3497', '9257', 'i', '5647', '7711', 'd', 'z', 'c', '5053', '3151', '8003', 'd', 'm', 'q', '213', '7373', 'k', 'w', '8211', '1083', '4815']
Example Output:
c, d, g, i, k, m, p, q, s, v, w, x, z