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.

[Q]: ['7301', '7999', 'x', 'r', '6881', 'e', '609', 's', '7495', 'a', 's', '1961', 'q', 'x', '373', '6289', '4847', '5969', 't', '5487', '7639', '9039', '2395', 'b', 'd', '1447', 's', '8137', 's', '443', 'f', 'z', '4823', 'k', 'i', 'o', '4739', 'w', 'f', '8853', 'a']
[A]: a, b, d, e, f, i, k, o, q, r, s, t, w, x, z


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


[Q]: ['7837', 'l', '6629', '4813', 's', '6809', 'k', 'n', '9861', '7099', '837', 't', 'z', 'v', '3241', '5661', '3549', 'c', '1703', '6315']
[A]:
c, k, l, n, s, t, v, z