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]: ['7917', '2295', 'q', 'v', '9373', 'w', 'n', 'q', '5803', 'g', 'k', 'm', '2167', 'k', '6425', 'x', 'g', '341', 't', 'u', '8829', 'h', '4333']
[EX A]: g, h, k, m, n, q, t, u, v, w, x

[EX Q]: ['315', '9975', '3013', 's', '6131', 'e', 'e', 'u', 'a', '1729', 'g', 't', 'y', 'f', '7523', 'e', 'g', '489', 'm', 'p', 'f', 'e', '2077', 'e', 'g', 'c', 'l', '6389', 'k', 'b']
[EX A]: a, b, c, e, f, g, k, l, m, p, s, t, u, y

[EX Q]: ['9781', 'x', '6811', '2387', '9251', '3931', '8799', 'x', 'y', 'q', 'o', '2163', '5275', 'q', 'e', 'u', 'i', '613', 'n', 'u', '649', 'k', 'n', '4855', '1995', '3067', 'm', 'f', 'i', '6611', '5975', '201', 'a', '6541', 'i', 'f']
[EX A]:
a, e, f, i, k, m, n, o, q, u, x, y