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]: ['565', 'i', '615', '3047', 'm', '195', '7547', '3003', '9213', '9063', 'c', '5099', 'v', '5003', '9053']
[A]: c, i, m, v


[Q]: ['e', 'q', 'y', '3991', 'k', 'a', '5083', 'y', '9445', '6221', '6133', 'r', '7151', '7989', '3413', 'u', 'n', '5601', 'k', 'b', 'y', '7163', 'l', 'w', 'u', '2917', '6829', '8571', '8225', '1711', 'c']
[A]:
a, b, c, e, k, l, n, q, r, u, w, y