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.

['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']
d, h, i, j, k, n, o, t, v, w, x, z

['7203', '8715', '3193', 'w', '7159', '8535', 'i', '2425', 'j', 'f', '6709', 'w', 'w', 's', 'e', '9337', 'r', 'r', '5255', '1707', 'u', '1443', 'e', 'e', 'v']
e, f, i, j, r, s, u, v, w

['j', '9083', '4539', '7777', 'w', '675', 'h', '1795', 'u', '9619', 't', '5399', '9551', 'x', 'a', '463', '4591', '5731', 'k', '5073', '2521', 'g', 'h', '9883', '4813', 'o', '8867', 'c', 'j', 'r', '4525', '9937', '8237', '715', '4063', 's', '3391', '8361', '4339', 'v']

a, c, g, h, j, k, o, r, s, t, u, v, w, x