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.

[EX Q]: ['163', 'x', 'g', '5997', 'm', 'l', '7225', '7907', '375', 'y', 'a', 'j', 'c', 'j', '7755', '147', 'h', '3845', 'y', 's', 'h', 'u', '8737', '6091', 'j', 'f', 'c', '7395', '881', '1771', 'y', '3691', 'h']
[EX A]: a, c, f, g, h, j, l, m, s, u, x, y

[EX Q]: ['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']
[EX A]: a, b, c, e, h, j, k, m, n, p, r, t, u, x, y

[EX Q]: ['t', '7819', 'h', '7767', 'z', 'e', 'i', '8583', '5117', '3641', 'x', '9785', 'g', '7815', 'f', 'g', '7433', 'm', '9433', '1385', 'p', 'j', 'r', 'a', '1001', 'g', '6717']
[EX A]:
a, e, f, g, h, i, j, m, p, r, t, x, z