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]: ['h', '1797', '8211', 'n', 'r', '7707', '2063', '4655', 'x', '5521', '8327', 'g', '7659', 'i', 'x', 'w', '9465', '4625', 'q', '5377', 'r', '225', 'r', 'i', 'e', '4163', 'g', 'g', '3537', 's']
[A]: e, g, h, i, n, q, r, s, w, x


[Q]: ['5099', '5099', 'p', '9427', 'a', 'z', '1761', '3443', '9525', 'g', 'c', 'e', '3937', 'g', 'j', 'w', '2533', 'l', '5379', '4573', 'o', '9523', '3957', 'n', '7661', '2177', '8389', '7243', '5819', '2609', '195', '3393', '2385', 'p', 'k', 'c']
[A]:
a, c, e, g, j, k, l, n, o, p, w, z