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', '5503', '5837', '4539', '7631', 'm', '2641', 'p', '7901', '8117', 'z', '3373', '3215', 'v', 'a', '5949', 'w', '9049', 'd', 'a', 'l', 'v', 'l', 'n', 'w', 'r', 'j', '9031', '9609', '4209', 'c', '7453', '5855', '2883', '5941', 't', '4283', 'x', 'x', 'n', 'c']
a, c, d, j, l, m, n, o, p, r, t, v, w, x, z

['j', 'f', '9567', 'f', '7383', 'k', '599', '1091', '1501', 'y', 'o', 'c']
c, f, j, k, o, y

['6155', 'c', 'q', '795', '2689', '9079', 's', 'l', 'o', 'n', 'x', 'j', '4153', 'n', '8401', 'j', 'j', 'e', '9115', '5519', 'j', '1859', '2117', 'm', 'h', 'a', '29', '2603', 'z', 'x', '1235', '541', '7605', '7287', 'l', '2503', '3207', '1439', 'e', 'z', 'y', 'f', 'n']

a, c, e, f, h, j, l, m, n, o, q, s, x, y, z