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.

['j', 'g', 'w', 'j', '5399', '6811', '5919', '9075', 't', '3191', '2261', 'p', '2871', 'h', '7963', '1491', 'e', 't', 'a', '9057', 'x', 'f', '2497', 'p', '1939', '6089', 'c', '1961', '867', '2851', '4647', 'i', 'p', 'z', '7117', '1949', '107', '9057', 'c', '8933', 'p', 'n', 'o', 's']
a, c, e, f, g, h, i, j, n, o, p, s, t, w, x, z