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: ['459', '1729', 'b', 'c', '9619', '4461', '4347', '6733', 'i', '3631', 's', 'j', 'i', 'r', '5293', 'q', '7397', '4309', 'c', 'n', 'k', '197', 'q', '8139']
Example Output: b, c, i, j, k, n, q, r, s

Example Input: ['4041', 'l', 'g', '9571', '9295', '1395', 'l', 'p', 'f', 'w', 'g', '1721', '2421', 'w', 'z', '2235', 'p', '7851']
Example Output: f, g, l, p, w, z

Example Input: ['6357', 'q', 'f', 'd', '4063', 'c', 'r', 'o', 'i', 'p', '5711', 'u', '4621', '7003', '5249', '8925', '6947']
Example Output:
c, d, f, i, o, p, q, r, u