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: ['o', '369', 'z', '5721', 'w', 'v', '4973', '7773', 'k', '3071', '5103', '425', '4239', '7977', 'n', 'i', 'k', '8117', '9843', 'n', 'd', '1353', 'h', 'd', 'v', 'z', 'j', '8727', '6997', 'x', '767', '4331', 't']
Example Output: d, h, i, j, k, n, o, t, v, w, x, z

Example Input: ['2381', '2865', '4821', 'n', 'u', 's', 'p', 'v', 'v', 'n', '1349', '7903', 'm', '193', 't', 'p', 'c', '3521', 'a', 't', '8281', 'i', '151', '4783', 'm', '3387', '9551', 'z', 'q', 'v', '4549', '4411', 'u', '8735', '2645', '359', '2871', '5923', '5071', 'c', '9843', 'i']
Example Output: a, c, i, m, n, p, q, s, t, u, v, z

Example Input: ['l', 'u', 'k', 'f', 'y', '6327', 'g', 'k', '7409', '4925', '2709', '9867', '565', '2617', '8613', '1645', '7923', 's', 'j', '1607', '1505', 'g', 'l', '4631', '6303', 'r', 'c', '1525', '2743', 'x', '2693', '1517', '8051', 'z', 'q', 'q', 'y', '8013']
Example Output:
c, f, g, j, k, l, q, r, s, u, x, y, z