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: ['9025', '3259', '4863', 'u', '6443', '9931', '627', 'x']
Example Output: u, x

Example Input: ['2521', '8027', 'm', '193', '615', 'l', '1947', '5949', '6307', 'r', '1015', '743', 'v', '6949', 'b', 'g', '8841', 'c', 'b', '2879']
Example Output: b, c, g, l, m, r, v

Example Input: ['i', '4667', 'i', '5813', '365', '8085', 'o', 'u', '2615', 'w', 'e', 'g', '4615', 'k', 'f', '3301', '1953', 'q', 'n', 'h', 'h']
Example Output:
e, f, g, h, i, k, n, o, q, u, w