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.

['u', '8229', '2731', '6595', '4675', 'n', 'a', '7361', '7401', '7273', 'b', '279', '5539', '7919', 'j', 'x', '9521', '8837', '7391', 'h', 'x', 'h', '7283', 't', '3769', '2317', '9131', 'h', 'y', 'c', '1625', 'm', 'e', 'a', '8437', '7543', 'p', '2451', 'k', 'r']
a, b, c, e, h, j, k, m, n, p, r, t, u, x, y

['n', 'h', 'j', '5945', '8511', 'y', '7739', '4717', '2483', 'p', '9545', '7647', '9863', '5591', '5393', 'i', '9225', '589', '1497', 'j', 'm', '2397', 'a', 'd']
a, d, h, i, j, m, n, p, y

['p', 'e', '981', 's', '7129', '7973', 'e', 'b', '5439', 'x', 'g', 't', 'd', '9365', 'z', '1347', '1149', 'o', '8479', '5099', '5663', 'x', '4195', '3631', 'j', '8647', 'u']

b, d, e, g, j, o, p, s, t, u, x, z