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.

['7839', '849', '5651', '4275', 'e', '5453', 'h', '2099', '485', 'i', 'm', 'n', '6563', '5675', '4001', 'h', 'm', 'z', '3467', '4237', '5035', '5609', '8475', '5171', 'v', '3883', '8461', '8611', '4853', 'd']
d, e, h, i, m, n, v, z

['c', '1693', 'l', 'u', 'x', '3609', 'h', '4159']
c, h, l, u, x

['i', '1191', '8503', '5587', 'k', 's', 'j', '3769', '9899', '7265', 'i', 'w', '191', '6881', 'm', 'm', '7735', '3681', '6121', '1995', '7153', 'h', 'm', '9627', 'i', '421', 'k', '2463', '2163', '3051', 'h', 'j', '5503', '411', 'q', 's', '6533', '1157', '1503', 'd', '3517', 't', '7921']

d, h, i, j, k, m, q, s, t, w