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: ['i', 'x', 'n', 'w', '8915', 'd', 'd', 'd', '6025', '7861']
Example Output: d, i, n, w, x

Example Input: ['f', 'p', 'n', '839', '9229', 'r', '7661', 'c', '4383', 'u', 'k', '5321', '3181', '1785', 'w', 'k', '8721', '7855', '4093', '6495', 'q', '2467', 'g']
Example Output: c, f, g, k, n, p, q, r, u, w

Example Input: ['5947', '1473', '3059', 'e', 'n', '8907', '4415', 'd', '145', 'd', 'a', 'e', '633', '3157', '2329', 'u', 'b', '543', '3899', 't', 'h', '8655', 'y', 's', 'g', '9613', '541', '7237', '6849', 't', 'd']
Example Output:
a, b, d, e, g, h, n, s, t, u, y