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: ['9483', '501', 'j', 'k', '3103']
Example Output: j, k

Example Input: ['3223', 'h', 'w', 'f', 'y', '1667', '8843', '8759', '9203', '3305', '3549', '5507', '6251', 't', '8319', '9121', '6643', 'u', '4273', '4429', '7543', '7909', '789', '9183', '5729', 'd', '7063', 'b', '6677', 'w', 'x', 'x', 'z', '769', 'p', 'd', 'h']
Example Output: b, d, f, h, p, t, u, w, x, y, z

Example Input: ['5095', '3973', '8557', '331', 'h', '303', '9063', 'y', '7861', '1963', 't', '8811', '6553', '3107', 'x', '1601', 'k', 'd', 'z', 'd', '1245', '7623', '123', 'l', '1741', '7305', 'b', 'w', 'j', 'v', 't', '523', 'c', 'm', 'e', '1677', 'u', '3423', '7819']
Example Output:
b, c, d, e, h, j, k, l, m, t, u, v, w, x, y, z